Interesting facts about the human body for children. Interesting facts about the human body

How can you determine a person's age?

Research by American scientists has shown that a person’s age can be determined with an error not exceeding 10% by analyzing the isomers of amino acids contained in teeth and eyes.

How often should you wash your hair?

You need to wash your hair when it gets dirty. For some, once a week is enough, for others, every day. The main thing is to keep your scalp and hair always clean.

How many cells are there in the human body?

There are approximately one hundred trillion cells in the human body, but only a tenth of them are human. The rest are microbes. They inhabit our skin, live in the nasopharynx, and throughout the intestines.

What does insufficient water supply to the body lead to?

Specialists from medical center The British city of Leeds claims that insufficient fluid intake in the body leads to problems with studying. A study conducted in several schools and colleges found that children who drink up to eight glasses of water get better grades than those who drink less fluid. This may be due to the fact that with normal fluid intake into the body, capillary blood flow improves. The brain is better supplied with blood carrying oxygen - the thinking process is activated, and memory works better.

Which ligament is the strongest in the human body?

The strongest ligament in the human body is the ligament of Bertinius, which strengthens hip joint, - can withstand a load of 350 kg.

Where are the strongest muscles in humans?

The strongest muscles are those located on both sides of the mouth and are responsible for clenching the jaws. They are capable of developing a force of about 70 kg.

What is the difference between a laughing and a crying person?

According to studies by French neurologists, crying man 43 facial muscles are involved, while a person laughing has only 17. Thus, laughing is energetically more beneficial than crying.

At what time of day do muscles work most productively?

It is noted that muscles work most effectively at 13:00. 30 min.

What is the total length blood capillaries in the human body?

The total length of blood capillaries in the human body is approximately 100 thousand km, which is 2.5 times the length of the equator, and the total internal area is 2,400 square meters. m.

What is the liver's carrying capacity?

The liver passes through more than 100 liters of blood in one hour.

What is the thickness of a blood capillary?

Blood capillaries are 10 times thinner than hair.

What is a complete blood circulation equal to?

A complete circulation of blood through both circles of blood circulation is completed in 21-23 seconds.

What is the volume of blood in human arteries?

In human arteries, the blood volume is on average 950 ml.

How long (in time) does it take for a hemoglobin molecule to form?

“Assembling” a hemoglobin molecule takes only 90 seconds. Every second, 6.5x1014 hemoglobin molecules are synthesized in the human body.

How long is the intestine?

The length of the human intestine exceeds the length of the body by 3-4 times.

What is the composition of blood plasma?

The composition of blood plasma resembles the composition of the water of the ancient seas on Earth, in which life originated.

How much do we “cry”?

Healthy human organ ISM produces approximately 0.5 liters of tear fluid per year.

When do nails and hair grow faster?

Nail and hair growth occurs most intensively between 16 and 18 hours.

What is the lifespan of hair?

Eyebrow hair, eyelashes and armpit hair live for 3-4 months, scalp hair - 4-6 years.

Does a beard contribute to scalp baldness?

Physiologists from the University of Lyon (France), studying the heat exchange of the head in men, found, according to them, a connection between the size of the beard and thick hair: the larger and more luxuriant the beard, the more the hair on the head falls out and the more often baldness develops. If in winter, warming the face with a beard has a positive effect, then in summer, especially when physical effort, the bearded man's head and brain are overheating. So, a beard contributes to baldness.

How many children can a woman give birth to during her childbearing period?

The Russian peasant woman Vasilyeva, who is known to have been born in 1707 in Shuya, had the most children (as officially registered). This woman gave birth 27 times and had 69 children between 1725 and 1765: 16 twins, 7 triplets and 4 quadruplets.

People's attitude towards the birth of twins?

The birth of twins occurs in 80-85 singleton births. Some ancient peoples considered the appearance of twins to be a bad omen. For example, in order to avoid trouble, the people of the Nigerian Ibu tribe threw away all the food and fuel that were in the house at the time of the birth of the twins. In Uganda, twins were not considered people and were equated with animals. The Saliva Indians of the Venezuelan tribe were sure that twins could only be born from two fathers, and they beat the woman in labor “for adultery.” But the North American Cocopa Indians called the twins messengers of the gods and treated them with exceptional respect.

Where can stones form in the human body?

In the human body, stones can form almost anywhere, for example in the kidneys (urolitis), gallbladder(choleolitis), veins (angiolitis), lungs (pulmolitis), bronchial tubes (broncholitis), nasal passages (rhinolitis), muscles (myolitis), bones (osteolitis), tumors (tumorolitis) and even in the cornea of ​​the eyes (ophthalmolitis).

Man is a social being. The most amazing, complex, beautiful and incomprehensible of everything that exists on Earth. It will never cease to be discussed, studied and be the focus of attention of scientists and doctors from all countries.

Nowadays, the origin of man is most often studied not so much as the origin of the organism. It is this confusing and not always explainable system that is our “little universe”, which allows us to live and develop.

But still, we collected the most interesting things and decided to share them with you.

Females are much more sensitive to odors than males

Scientists have proven more than once that men smell worse than women. As it turns out, the reason for this is that women have more cells in the area of ​​the brain that are responsible for our sense of smell. It's funny that in the female brain the area responsible for smell weighs less than in the male brain. However, the fair sex has 50 percent more cells responsible for the sense of smell.

It can be assumed that the greater sensitivity to smells in girls is an evolutionary mechanism that helps in choosing a partner for life. As a result of numerous studies, it has been proven that by smell a person subconsciously determines the quality of genes immune system and thus choose partners with a different genotype.

A person can live much longer without food than without sleep.

Lack of sleep leads to various negative effects, such as decreased concentration and attention, irritability, slowed mental processes, problems with coordination, memory lapses, decreased motivation and a distorted perception of reality. Also, not getting enough sleep causes a colossal load on the heart and all human organs, and the body may simply not be able to withstand it.

The human brain is like a computer

Most children are born with blue eyes

Interesting fact: Eye color can change not only in newborns, but also in adulthood. It depends on the emotional state person, his well-being and stressful situations. More people on the planet - brown-eyed. But people with green eyes are very rare.

Human cells: the largest and smallest

Previously, the egg was considered as a passive player in the process of conception: it waits for the sperm to run towards it.

The only part of the body where blood does not flow

Another interesting fact is that our cornea is similar in structure to the cornea of ​​a shark. Thanks to this knowledge, surgeons are already using shark corneas as a donor in operations.

Every second the lens can unconsciously focus on 50 objects. For comparison: the most sophisticated photo lens takes 1.5 seconds to change focus.

Let's weigh our lungs

The human body is an incredibly complex and intricate system that still baffles doctors and researchers, despite the fact that it has been studied for hundreds of years. Therefore, it is only natural that our body parts and normal bodily functions can surprise us. From sneezing to growing nails, here are 100 of the weirdest, wackiest and most interesting facts about... human body.

Brain

The brain is the most complex and least studied human organ. There is a lot we don't know about him, but nevertheless, here are some facts about him.

1. Nerve impulses from the brain and to the brain move at a speed of 270 km/h. Ever wondered how you can react so quickly to all sorts of things and why your finger immediately hurts as soon as you pinch it? It's all because of the incredible high speed movement of nerve impulses from all parts of the body to the brain and back. They provide responsiveness and move at the speed of an expensive sports car.
2. The brain requires as much energy to function as a 10-watt light bulb. The cartoon trick with a light bulb over your head is not so unreasonable. Your brain needs as much energy as a small light bulb - even when you're sleeping.
3. A human brain cell can store five times more information than any encyclopedia. Scientists have not agreed on the memory capacity of the human brain, but it can hold somewhere between three and a thousand terabytes of information. For example, the National Archives of Britain, with its 900-year history, occupies only 70 terabytes, so evaluate your brain reserves!
4. The brain uses 20% of all oxygen that enters the circulatory system. The brain occupies only 2% of body weight, but consumes more oxygen than any other organ - so it is dramatically affected by the lack of oxygen. So breathe deeply!
5. The brain is much more active at night than during the day. It would be logical to assume the opposite: after all, during the day we perform various actions, we think, we communicate - and this requires more energy than just lying in bed. But it turns out that everything is completely different. When you switch off, your brain switches on. Scientists have not yet figured out why this happens, but in any case, thanks to the brain for interesting dreams!
6. Scientists say that the higher the IQ level, the more often people dream. That may be true, but don't think you're stupid if you can't remember your dreams. Most people don't remember what they dream, but average length sleep - only 2-3 seconds - quite enough to understand that you see something.
7. Neurons continue to grow throughout a person's life. For many years, scientists and doctors thought that the brain and nerve cells cannot grow and regenerate. Of course, they do this not as intensively as other tissues, but they grow throughout life, adding new and new areas for studying the brain and the diseases affecting it.
8. Information passes through different neurons at different speeds. Not all neutrons are the same. There are several types of nerve cells, and the speed at which information passes through them ranges from half a meter to almost one hundred and twenty meters per second.
9. The brain itself does not feel pain. Without a brain you won’t feel pain: if you cut your finger, the brain will give you a signal that something is wrong with it, and you will feel pain. But the brain itself does not hurt. Your head may hurt: there is a lot blood vessels and nerves that cause pain.
10. 80% of the brain consists of water. The brain is not a solid gray mass like they show on TV. Living brain tissue is soft, pink and jelly-like due to blood flow and high content fluids in tissues. So the next time you want to drink, don’t put it off for too long: your brain suffers!

Hair and nails

In fact, these are not living organs, but remember how your friends worry about their nails and hair, how much money they spend on caring for them! On occasion, you can tell your lady a couple of these facts: she will probably appreciate it.

11. Hair grows faster on your face than anywhere else. You probably guessed this when you shaved in the morning, and in the evening you were already covered with stubble. If a man had not shaved, his beard would have grown up to seven and a half meters in his lifetime! But this is too much, don’t you agree? After all, you can grow more.
12. Every day a person loses an average of 60 to 100 hairs. Unless, of course, he is already completely bald or is in the process of going bald - then, of course, he will lose even more hair. The amount of hair falling out depends on the season, health, diet, age, and for friends, also on pregnancy.
13. Diameter women's hair half that of men. This will seem strange, but quite logical: men's hair is thicker than women's. Hair thickness also depends on race.
14. Human hair can bear 100g weight. This, by the way, is half a glass of something! And if the hair is all together, then somehow you even believe in Rapunzel’s story.
15. The nail on the middle finger grows faster than the others. And the nail on the middle finger of the dominant hand is generally a champion in terms of growth rate. Why, we don’t fully know, but the speed of nail growth is somehow related to the length of the finger, so nails grow fastest on long fingers, and slowest on short ones.
16. There is as much hair on a square centimeter of your body as there is on a square centimeter of a chimpanzee's body. We're not as hairless as we think! We have a lot of hair, but most of it is too fine for us to see.
17. Blondes have more hair. Hair color determines its density on the head. The average person has 100,000 hair follicles, each can grow 20 hairs in a lifetime. Blondes have 146,000 hair follicles, and brunettes have about 110,000. Brown-haired and fair-haired people have just the average number - 100,000, and redheads have about 86,000.
18. Fingernails grow about 4 times faster than toenails. You've probably noticed that you trim your fingernails more often, so it's all logical. They are used more often, the fingers are longer - this is the result. On average, nails grow by 2.5 mm per month.
19. Average duration The life of a human hair is 3-7 years. And although you lose a lot of hair every day, it lives a long time. They managed to visit different haircuts and modifications - and for some even in different colors!
20. You have to be at least half bald for it to be noticeable. You're losing hundreds of hairs every day, and you'll have to lose a lot more before someone notices. And this will not happen before your hair has halved.
21. Human hair is practically indestructible. Yes, they burn well, but they are generally difficult to destroy. Have you ever wondered what is clogging your pipes? Hair is resistant to cold, climate change, water and other natural forces, and they are resistant to many types of acids and caustic chemicals.

Internal organs

We don’t remember the internal organs until they bother us, but it is thanks to them that we can eat, breathe, walk and all that stuff. Remember this the next time your stomach growls.

22. The largest internal organ is small intestine. Despite the fact that it is modestly called thin, it is really large: its length is four times the average human height. If it had not been twisted so cleverly, it would not have fit into the abdominal cavity.
23. Human heart creates pressure that is enough for blood to spray seven and a half meters forward. Therefore, it is understandable why it is so easy to feel the heartbeat. In order for blood to move quickly throughout the body, great pressure is necessary, which arises as a result of strong contractions of the walls of the ventricles pushing the blood.
24. The acid in your stomach can dissolve razor blades. You should not check this and eat blades or other metal objects, but know: the concentration of this acid is not weak! The hydrochloric acid in your stomach can digest not only pizza, but also metal.
25. The length of all blood vessels in the human body is about 96,000 km. For comparison: the length of the equator is 40,000 km, so your blood vessels are enough to wrap them around the Earth twice - and still have some left.
26. Your stomach is completely renewed every 3-4 days. The muscular walls of the stomach would quickly dissolve into the same hydrochloric acid, if only they had not regenerated so quickly. Guys with heartburn know how unpleasant it is when you feel the effects of acid.
27. The surface area of ​​a person’s lungs is equal to the area of ​​a tennis court. In order for oxygen to enter the blood more efficiently, the lungs are filled with thousands of branches of the bronchi and tiny alveoli, shaped like bunches of grapes. They are filled with microscopic capillaries through which oxygen and carbon dioxide. Big square speeds up and facilitates this exchange.
28. A woman’s heart beats faster than a man’s. The reason is that on average women fewer men, and the blood must be dispersed over a smaller area. And in general, the hearts of men and women work differently - for example, treatment regimens for heart attack, which work for men, are ineffective in cases with women.
29. Scientists say that the liver has more than 500 functions. You never think about your liver - except on a hangover morning, and by the way, it is one of the largest, busiest organs that works a lot. Some functions of the liver are: production of bile, breakdown of red blood cells and detoxification.
30. The aorta has a diameter of almost equal to diameter garden hose. The human heart is on average the size of two fists, so the size of the aorta is also impressive. It is so large because it is the main conductor of blood throughout the body.
31. The left lung is smaller than the right - so that there is room for the heart. When most people draw their lungs, they make them roughly the same size. They are approximately the same size, but the fact is that the heart is slightly shifted to the left relative to the middle, and therefore left lung have to make room.
32. You can remove most of the internal organs and move on with your life. The human body seems fragile, but it is possible to live even without a stomach, spleen, 75% of the liver, 80% of the intestines, one kidney, one lung and almost every organ located in the pelvic and groin cavity. Of course, you're unlikely to be like a cucumber, but it won't kill you.
33. The adrenal glands change size throughout human life. They are located directly above the kidneys, as you understand from the name, and are responsible for the production of stress hormones - cortisol and adrenaline. In the seventh month of fetal development, they are the same size as the kidneys. At birth, the glands contract and continue to do so throughout life. By the time you reach old age, they will become barely noticeable.

Organism's functions

We don't really like to talk about them, but we have to deal with them every day. Here are some facts about the not so pleasant things that concern our body.

34. The speed of a sneeze is 160 km/h. That's why you can't keep your eyes open when you sneeze: the air rushes out of your nose at great speed! So it makes sense to cover up.
35. The speed of coughing can even reach 900 km/h. The infection spreads throughout the office or classroom - wow, crap! After all this, flu epidemics are not at all surprising.
36. Women blink twice as often as men. Every day you blink many times. On average - 13 times per minute.
37. Full bladder reaches the size of a softball. No wonder you have to run to the toilet when you feel this wild call of nature! The bladder holds from 400 to 800 ml of liquid, but most people begin to want to go to the toilet when it contains somewhere around 250-300 ml.
38. Approximately 75% of human waste products consist of water. Rejoice in this! The drier the stool, the more painful the process of getting rid of it is.
39. There are approximately 500,000 on their feet sweat glands, they can produce up to a liter of sweat per day! Now it’s clear why these shoes stink so much. Men also sweat much more actively than women.
40. Over the course of a lifetime, a person produces so much saliva that it can fill a couple of swimming pools. Saliva plays an important role in the digestion process and keeps the mouth clean.
41. The average person passes gas 14 times a day. Even if you think you're too good for it, the reality is: you fart several times a day. Digestion causes the body to release gases, there is no escape from this.
42. Earwax is essential for healthy ears. Many people think that she is disgusting, but in reality she is important thing for the health of your ears. It protects sensitive inner ear from bacteria, dirt and even insects. It also lubricates and cleans the ear canal.

Sex and procreation

Sex is a largely taboo but very important part of human life and relationships. Continuation of the family line is no less important. There are probably a few things you didn't know about them.

43. Every single day, 120 million sexual acts occur in the world. 4% of the world's population has sex daily, and birth rates around the world continue to rise.
44. The largest human cell is the egg, and the smallest is the sperm. You can't see skin cells or muscle cells, but the egg is large enough to be seen with the naked eye: its diameter is about a millimeter. A male sperm, on the contrary, tiny.
45. During the first trimester of pregnancy, women most often see frogs, worms and plants in their dreams. Hormones during pregnancy can cause mood swings and all sorts of other unexpected things. They can even influence dreams! And many women during pregnancy see water, childbirth and erotic scenes in their dreams.
46. ​​Your teeth begin to grow six months before you are born. Rarely are babies born with teeth, but teeth nonetheless begin to grow under the gums while still inside the womb.
47. Almost all children are born with blue eyes. Eye color depends on your parents' genes, but most children are born with blue eyes. It's all about the pigment melanin. The melanin in a newborn's eyes often takes time to either fade when exposed to light or develop to reveal the baby's true eye color.
48. Children are strong, like bulls. Of course, they cannot pull a cart, but if they were the size of an ox, they probably could. They are very strong for their tiny size. So be careful: they are kicking!
49. One in 2,000 children is born with a tooth. Sometimes it's normal baby tooth, which will remain with the child until it is replaced by a molar, and sometimes it is an extra tooth that soon falls out.
50. The fetus acquires fingerprints at the age of three months. More on early stages During the development of fetuses, one of the most unique human traits appears - fingerprints. At 6-13 weeks of development, they already take on clear outlines. Oddly enough, these imprints will not change throughout life and will be one of the last things to disappear after death.
51. Each person was a single cell for half an hour of his life. Even the largest of us were once a single cell - a zygote, a fertilized egg. Soon she began to divide and develop into an embryo.
52. Most men have an erection every hour and every hour and a half during sleep.: After all, the brain is much more active at night. Blood circulation and testosterone cause erections during sleep, a normal part of REM sleep.

Feelings

We perceive the world through our senses. Here are interesting facts about them.

53. After a hearty lunch, we hear worse. If you are going to a concert after have a nice lunch, you're doing yourself a disservice. Eat less to hear better.
54. Only one third of all people have one hundred percent vision. Glasses and contact lenses the other two-thirds wear it - or they should. People with good eyesight is getting smaller.
55. If saliva cannot dissolve something, you will not feel the taste. To feel the taste of food or whatever you decide to try, saliva must dissolve it. If you don't believe me, try drying your tongue before tasting something.
56. From birth, women have a better developed sense of smell than men. Research has shown that women better than men smells. They better identify citrus, vanilla, cinnamon and coffee smells. And another 2% of people cannot smell. At all.
57. The nose remembers 50,000 different aromas. A bloodhound's nose may be a million times more sensitive than a human's, but that doesn't mean the human sense of smell is no good. People can identify wide range scents, many of which are associated with their memories.
58. Pupils dilate even due to slight interference. It is believed that this is why surgeons, watchmakers and other people doing delicate work cannot stand the noise. The sound causes their pupils to change focus, causing them to see less clearly, which makes them less able to do their job.
59. All people have their own unique smell - with the exception of identical twins. Newborns recognize their mother by smell, and many of us know the smells of our loved ones. This smell is partly determined genetically, but it also depends on the environment, diet, hygiene products, etc.

Aging and death

We age throughout our lives - that’s how it works.

60. The mass of the ashes of a cremated person can reach 4 kg. The fact is that the body contains a lot of water. And when the body burns, the water evaporates and dry matter remains.
61. Hair and nails grow after death. They appear longer when a person dies because the skin becomes dehydrated and the base of the nail and hair roots recede.
62. By the age of sixty, most people have lost about half of their taste buds. Maybe you shouldn't trust your grandmother to cook so much? Older people have a worse sense of taste - so they may over-salt, add more sugar, etc.
63. Your eyes are the same size all your life, but your nose and ears grow throughout your life. Children are looking at you with huge eyes- but they only seem huge: their size will never change. But the ears and nose will grow and grow!
64. At 60 years old, 60% of men and 40% of women will snore. If you've ever heard snoring, you know how loud it can be. Normal snoring- approximately 60 decibels, at the level of normal speech. And intense snoring reaches 80 decibels - it's like a jackhammer hitting concrete.
65. A child’s head is a quarter of his height, and by the age of 25, the length of the head is only an eighth of the entire length of the body. The head changes size in different proportions than the body. The legs and torso are still growing, but the head is no longer there.

Diseases and injuries

We all get sick and injured. And this is also quite interesting!

66. Most often, a heart attack occurs on Monday. Monday is a hard day, a very bad day! A ten-year study in Scotland found that heart attacks are 20% more likely to occur on Mondays. Scientists believe that there is a combo of a too fun weekend and a too harsh start to the week.
67. People can go much longer without food than without sleep. It's much more pleasant for you to have fun all night than not to eat, but this feeling is deceptive. If a person has enough water, he can spend a month and in some cases even live for two years without food, maintaining strength with fat accumulated in the body. Without sleep, people experience psychological changes - and this is after just a few days without sleep. The longest period of wakefulness is 11 days. The person who set this record started talking during the experiment, saw hallucinations and forgot what he was doing.
68. When you burn in the sun, it damages your blood vessels. They return to normal condition for 4-5 months. Remember this the next time you are too lazy to put sunscreen on your face.
69. 90% of illnesses are due to stress. Yours nervous work can cost you your health, slowly killing you day by day. It can also cause depression, high blood pressure and heart disease.
70. A human head remains conscious for 15-20 seconds after it is cut off. Amazing fact how strong the brain is to be able to remain alive without the rest of the body! Although the duration of this consciousness varies, judging by the stories of eyewitnesses.

Muscles and bones

Muscles and bones are the frame of our body, thanks to them we move and even just lie.

71. You tense 17 muscles to smile and 43 to frown. If you don't want to strain your face, smile. One who often walks for a long time with with a sour expression, knows how hard it is.
72. Children are born with 300 bones, but adults have only 206. The reason is that many of the children's bones must subsequently fuse together - for example, some of the bones of the skull. Why don't they do this in the womb? And this makes it easier for him to get through birth canal. Bones heal as children grow.
73. In the morning we are a centimeter higher than in the evening. The cartilage between our bones contracts as we stand, sit and walk, causing us to shrink slightly every day.
74. The strongest muscle of the human body is the tongue. Of course, this cannot be verified, but it is true. Remember this when you eat. During the day, your tongue tenses more than any other muscle.
75. The heaviest bone in the human body is the jaw. Unexpected, right?
76. To take a step, you use 200 muscles. This is a big load: on average a person takes 10,000 steps per day.
77. The tooth is the only organ that is not capable of regeneration. So go to the dentist, it won't heal on its own.
78. Muscles deflate twice as fast as they inflate. But this is not a reason not to train! Increase muscle mass relatively easy, so that should motivate you.
79. Some bones are stronger than steel. This doesn't mean bones don't break: they do. The steel is just heavier. And so, bone is a durable thing.
80. The feet contain a quarter of all the bones of the human body. Of the two hundred and six bones of the human body, 52 are located in the legs.

At the cellular level

There are things that you cannot see with the naked eye.

81. There are 16,000 bacteria per square centimeter of your body. But most of them are completely harmless, don't worry.
82. Every 27 days you literally change your skin. The skin protects sensitive internal organs from the outside world, and this is not an easy task. So it dries and peels off about once a month to maintain its strength. Chances are, the skin of your last month is still in your home: dust on your bookshelves and under the couch.
83. Every minute 3,000,000 cells die in the human body. It sounds like it's a lot, but in reality it's absolutely not. In general, there are about 10-50 trillion cells in the body, so you can afford such losses.
84. Humans lose about 600,000 pieces of skin every hour. Don't think about it unless you're sunburned. New cells immediately replace the old ones.
85. Every day, the adult human body produces 300 billion new cells. Your body needs energy to keep your organs functioning and functioning properly. in the right condition to repair holes and stuff like that.
86. All tongue prints are unique. If you're planning to commit a crime, don't touch anything with your tongue!
87. There is enough iron in your body to make a 6cm nail. Anyone who has tasted blood knows that it smells of iron. Here it is! And when there is too little of it, anemia develops.
88. The most common blood type in the world is first. It is very useful because it can be transfused to people with a different blood type. The most rare group blood - fourth.
89. Lips are red because there are many capillaries under them. Blood flows through them, and the blood is red. Therefore, in patients with anemia, the lips turn pale, and after swimming in cold water- turn blue.

Miscellaneous

A couple more interesting facts

90. The colder the room where you sleep, the higher the likelihood that you will have a nightmare. If you want to have more pleasant dreams, cover yourself better.
91. Tears and mucus contain the enzyme lysozyme, which destroys cell walls many bacteria. This is in your best interest: mucus in the nose and throat, as well as tears, prevent illness.
92. In half an hour, your body releases as much energy as it takes to boil one and a half liters of water. So the energy we expend just to maintain a constant body temperature is enough to cook pasta.
93. Your ears stand out more earwax when you're afraid. The chemicals and hormones that rise during fear have this strange effect.
94. You can't tickle yourself. The brain just knows what you are going to do.
95. The distance between your arms outstretched to the sides is your height. Not to the last millimeter, of course, but approximately.
96. Man is the only animal that cries because of emotions. We are the greatest crybabies in the entire animal kingdom.
97. Right-handers live on average nine years longer than left-handers. This is not based on genetics, the fact is that all machines and tools are made for right-handed people, so working with them is more dangerous for left-handed people.
98. Women burn fat slower than men - by about 50 calories per day. It’s just that women are naturally destined to bear children, so they should have more fat in their bodies. And that’s why it’s harder for them to lose weight.
99. Koalas and primates are the only animals with unique fingerprints.
100. The pit between the nose and lip has a name. Nasal philtrum. It is not clear why this is needed, but the ancient Greeks even thought that this was one of the most sensitive erogenous zones all over the body.

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1. The only part of the body that does not have a blood supply is the cornea of ​​the eye. It receives oxygen directly from the air.
2. The capacity of the human brain exceeds 4 terabytes.
3. Up to 7 months, the baby can breathe and swallow at the same time.
4. Our skull consists of 29 various bones.
5. A nerve impulse from the brain moves at a speed of 274 km/h.
6. One human brain generates more electrical impulses in one day than all the world's phones combined.
7. The average human body contains enough sulfur to kill all the fleas on average dog; carbon - to make 900 pencils; potassium - to shoot a toy cannon; fat - to make 7 bars of soap; and enough water to fill a 50 liter barrel.
8. The human heart pumps 182 million liters of blood during its life.
9. 50 thousand cells in your body are dying and being replaced by new ones as you read this sentence.
10. The embryo acquires fingerprints at the age of 3 months.
11. Women's hearts beat faster than men's.
12. A man named Charles Osborne hiccupped for 68 years.
13. Right-handed people live on average 9 years longer than left-handed people.
14. About 2/3 of people tilt their head to the right when kissing.
15. A person forgets 90% of his dreams.
16. The total length of blood vessels in the human body is approximately 100 thousand km.
17. In spring, the respiratory rate is on average 1/3 higher than in autumn.
18. By the end of life, a person remembers on average 150 trillion bits of information.
19. 80% of the human body's heat leaves the head.
20. When you blush, your stomach turns red too.
21. Thirst occurs when water loss equals 1% of body weight. A loss of more than 5% can lead to fainting, and more than 10% can lead to death from dehydration.
22. There are at least 700 enzymes working in the human body.
23. Humans are the only creatures that sleep on their backs.
24. On average, a 4-year-old child asks 450 questions a day.
25. In addition to humans, koalas also have unique fingerprints.
26. Only 1% of bacteria cause illness in humans.
27. All the people on the planet can be comfortably placed in a cube with a side of 1,000 meters.
28. Scientific name navel - umbilicus.
29. The tooth is the only part of the human body that is not capable of self-healing.
30. On average, it takes a person 7 minutes to fall asleep.
31. A right-handed person chews most of his food right side jaws, left-handed - on the left.
32. Only 7% of people in the world are left-handed.
33. The aroma of apples and bananas helps you lose weight.
34. The length of hair on the head that a person grows on average during his life is 725 km.
35. Among people who can move their ears, only 1/3 can move one ear.
36. Average person swallows 8 small spiders in its entire life.
37. The total weight of bacteria living in the human body is 2 kg.
38. 99% of all calcium in the body is found in the teeth.
39. Human lips are hundreds of times more sensitive than fingertips. A real kiss increases your heart rate to 100 beats per minute or more.
40. The absolute strength of the masticatory muscles on one side is 195 kg.
41. During a kiss, 278 different cultures of bacteria are transmitted from one person to another. Fortunately, 95% of them are harmless.
42. Parthenophobia is the fear of virgins.
43. Tooth enamel- the most hard fabric produced by the human body.
44. If you collect all the iron contained in the human body, you will only get a small screw for a watch.
45. There are more than 100 different viruses, causing runny nose.
46. A kiss of sufficient length is much better than chewing gum at normalizing acidity in the oral cavity.
47. By hitting your head against a wall, you can lose 150 kcal per hour.
48. Man is the only representative of the animal world capable of drawing straight lines.
49. During a lifetime, a person's skin changes approximately 1,000 times.
50. Every person has dimples on the lower back, only in some they are pronounced, while in others they are less noticeable. The dimples are located where the pelvis meets the sacrum, so their appearance is quite reasonable.
51. Women blink approximately 2 times more often than men.
52. The human body contains only 4 minerals: apatite, aragonite, calcite and cristobalite.
53. Real a passionate kiss causes the same chemical reactions in the brain as skydiving and shooting a pistol.
54. Men are considered dwarfs if their height is below 130 cm, women - below 120 cm.
55. Fingernails grow approximately 4 times faster than toenails.
56. People with blue eyes are more sensitive to pain than others.
57. Nerve impulses in the human body travel at a speed of approximately 90 meters per second.
58. In the human brain, 100 thousand events occur in 1 second. chemical reactions.
59. Children are born without kneecaps. They appear only at the age of 2–6 years.
60. If one of the identical twins is missing a particular tooth, as a rule, the other twin will also be missing the same tooth.
61. The surface area of ​​human lungs is approximately equal to the area of ​​a tennis court.
62. On average, a person spends 2 weeks kissing in his entire life.
63. Blondes grow a beard faster than brunettes.
64. Leukocytes in the human body live 2–4 days, and erythrocytes - 3–4 months.
65. The strongest muscle in the human body is the tongue.
66. The size of a person's heart is approximately equal to the size of his fist. The weight of an adult human heart is 220–260 grams.
67. From the moment of birth, there are already 14 billion cells in the human brain, and this number does not increase until death. On the contrary, after 25 years it decreases by 100 thousand per day. In the minute you spend reading a page, about 70 cells die. After 40 years, brain degradation accelerates sharply, and after 50, neurons (nerve cells) dry out and brain volume decreases.
68. At birth, a child’s body contains about 300 bones; in adulthood, there are only 206.
69. Small intestine During life, a person has a length of about 2.5 meters. After his death, when the muscles of the intestinal wall relax, the length reaches 6 meters.
70. Right lung a person holds more air than the left.
71. An adult takes approximately 23 thousand breaths (and exhalations) per day.
72. The smallest cells in a man's body are sperm cells.
73. There are about 40 thousand bacteria in the human mouth.
74. There are about 2,000 taste buds in the human body.
75. Human eye capable of distinguishing 10 million colors.
76. Chemical compound, responsible for the ecstasy of love (phenylethylamine), is present in chocolate.
77. The human heart creates pressure that is enough to raise the blood to the level of the 4th floor.
78. A person burns more calories while sleeping than while watching TV.
79. Children grow fastest in the spring.
80. Every year, more than 2,000 left-handed people die due to errors in the operation of machines designed for right-handed people.
81. It turns out that every 300th man has the opportunity to satisfy himself orally.
82. A person uses 17 muscles when he smiles and 43 when he frowns.
83. By age 60, most people lose half of their taste buds.
84. When flying on an airplane, a person's hair growth rate doubles.
85. 1% of people can see infrared radiation, and 1% - ultraviolet.
86. If you are locked in a completely enclosed room, you will die from carbon dioxide poisoning, not from lack of air.
87. According to statistics, only 1 person in 2 billion crosses the threshold of 116 years.
88. The average person speaks 4,800 words in 24 hours.
89. The retina inside the eye covers about 650 square meters. mm and contains 137 million light-sensitive cells: 130 million rods for black-and-white vision and 7 million cones for color vision.
90. Our eyes are always the same size from birth, but our nose and ears never stop growing.
91. In the morning a person is about 8 mm taller than in the evening.
92. The focusing muscles of the eye move 100 thousand times a day. For the leg muscles to make the same number of contractions, you need to walk 80 km a day.
93. A cough is an explosive charge of air that moves at speeds of up to 100 km/h.
94. According to German researchers, the risk of a heart attack is higher on Monday than on any other day of the week.
95. Bone is 5 times stronger than steel.
96. Impossible to sneeze with with open eyes.
97. Ingrown toenails are a hereditary trait.
98. Normal person will die from complete absence sleep faster than from hunger. Death will occur after about 10 days without sleep, while from starvation it will take a few weeks.
99. The average life expectancy is 2,475,576,000 seconds, during our lifetime we speak an average of 123,205,750 words and have sex 4,239 times.
100. You don't have to undergo surgery to get dimples on your cheeks. For this there is

Human body - extremely complex mechanism, unknown and unusual. A mechanism with keen senses and the ability to think. Understanding the structure of the human body is not only important, but also extremely interesting!

Let's try to reveal the secrets of the structure of the human body.

Of the six billion people who inhabit our planet, not even two are absolutely alike. Although the hundred trillion microscopic cells that make up every human body make all people on Earth 99.9% similar in structure.
All our cells, feelings, bones, muscles, heart, brain must work without errors. Nature arranged everything wonderfully.

Leather.

On the outside, we are protected by a velvety layer of protein-rich cells - our skin.

The skin is the most large organ our body. Skin protects us from mechanical damage, thanks to her we are able to feel pain and gentle touches. The skin on the palms, soles, tongue and lips is especially sensitive.

Skin also acts as insulation and a cooling system that maintains a constant body temperature. To achieve this, more than 2 million microscopic pores of the skin are capable of producing about 2 liters of sweat per hour. Sweat evaporates from the surface of the skin and cools the body.
In one month, a person’s skin completely changes. Old skin particles die off, and new skin continuously grows. We shed up to 700 grams of skin per year.

Kilometers of blood vessels stretch to the skin cells. And every square centimeter of skin is inhabited by hundreds of bacteria.
The skin produces an amazing substance - melanin. The color of skin, hair and even eyes depends on the amount of melanin. The more melanin, the darker the skin. When we tan, our skin darkens precisely because the amount of melanin increases under the influence of sunlight.

Eyes.

Eyes one of the most important organs person. Eyes make it possible to notice and follow everything that interests us.

The outer part of the eye is called cornea. The cornea catches light, and in order for it to do its job better, we moisturize it every few seconds. How do we do this? This is why we blink and our eyes never dry out.

The cornea sends a beam of light through the pupil onto the retina. The retina processes the signal and sends it along nerve endings into the brain. So we can see!

Ears.

But even if you perfect vision, everyone needs ears. Our ears, like locators, pick up surrounding sounds. However, this is not the only function of the ears.

They don't just hear - their ears are also responsible for balance. Jumping, running or even regular walking is impossible without a device hidden by nature in the depths of the ear - vestibular apparatus . Thanks to this device, a person learns to skate or bike without falling.

Voice.

Man is endowed unique gift- ability to speak. This opportunity is provided by the vocal cords.

Vocal cords- these are two plates located in the throat. They vibrate like the strings of a guitar. We change position with muscles vocal cords. When the exhaled air moves these strings, the sound of a voice is formed.

Breath.

The real reason why air comes out through the mouth is breathing.

It's hard to overestimate breathing. A person can only live for a few minutes without air. In one breath, we draw in half a liter of air, and so on 20,000 times a day.

Passing through the throat, the air enters the right and left lungs. Here the air is filtered from dust and harmful substances. Through the lungs, oxygen from the air enters our blood. Then exhalation follows, turning oxygen into carbon dioxide, we exhale the waste air.
And when we breathe, we can detect odors using the receptors in our nose. A person can distinguish up to 1000 aromas.

The respiratory system allows you to make sounds and recognize smells. Each breath provides our body with energy and makes our heart beat.

Heart and circulatory system.

Every second, every cell in our body requires oxygen. It is the blood that carries oxygen from the lungs throughout the body. About four liters of blood flow through arteries, veins and capillaries. There are very, very many such vessels, large and very tiny, in humans. The length of all human vessels reaches 96,000 kilometers. This is ours circulatory system.

But what makes blood run such a long way? Certainly, heart!

This tireless pump, contracting periodically, pumps all the blood throughout the body, saturating every cell of the body with oxygen. And then the blood flows back through the veins, taking away from each cell harmful substances, and thus cleanses the human body. All the blood passes through the body in less than a minute without stopping for a moment
If you add up all the strength of the heart in one day, then this strength is enough to lift a school bus.

Sometimes the blood flows even faster. This happens when we burn more oxygen. For example, we run, jump or dance. And while eating, our stomach requires more oxygen. Even while reading, the brain requires more oxygen.

However, blood does more than just carry oxygen. Each drop of blood contains up to 400,000 whites blood cells that fight the body's enemies. They are constantly on guard - tracking down viruses and bacteria. These heroic blood cells are called - leukocytes.

But we need not only air, but also fuel - food.

Digestion.

Carbohydrates, proteins, fats, vitamins, minerals- all the substances we need are taken by the body from food. the main objective digestion to take away all the most valuable things from every piece of food eaten.

The process of digestion begins even before food enters our mouth. As soon as you think about food or see a delicious sandwich, saliva begins to be produced. There are special substances in saliva - enzymes, they are the first to begin breaking down food. The human body produces half a liter of saliva in one day.

The tongue pushes the food chewed by the teeth into the esophagus and through the esophagus the food in the form of a paste enters stomach. In the stomach, food is affected by a very caustic gastric juice, and the walls of the stomach mix it, turning it into a liquid porridge. The stomach itself absorbs very few substances; it only prepares and transfers food to small intestine. Already there, within five hours, they will be squeezing food out of useful material, which enter the blood through the intestinal walls. Almost all useful substances will be delivered to the largest internal organ of a person - the liver. Here they are sorted and sent to all the cells of the body so that they grow and work well.

Over the next 20 hours, the remaining nutrients will be absorbed in the large intestine. And what cannot be digested will leave our body.

Muscles.

In our body from the tips of our fingers to the top of our heads there are about 650 various muscles . They make up almost half of the human body weight and allow us to move different parts of the body, often without even thinking about it. Without muscles, we could not run, blink, speak, or smile. When we pronounce even one single word, we work more than a hundred different muscles. And walking requires almost 200 trunk muscles. Imagine how many muscles work when you dance, swim or play tag.
But the muscles could not hold the body without a reliable frame - bones.

Skeleton, bones.

There are 206 amazing bones distributed throughout the human body, forming a perfect skeleton. Bones are extremely strong and at the same time very light. Bones grow and the size of the human body depends on the size of the bones. Joints connect bones and allow bones to move from side to side, up or down.

Brain.

All parts of the body and its organs are very complex, but they are all controlled from one center - everything is controlled brain.

With the help of nerves stretched throughout the body, the brain monitors all parts of the body - ears, eyes, skin, bones, stomach - the brain is responsible for absolutely everything. Thanks to the electrical and chemical impulses of the brain, we think, remember, feel, and act.
It is the brain that makes us human. Perhaps this is the most unexplored and mysterious part of our body.

Even when we fall asleep, all organs of the body continue to work - we breathe, the heart beats, new cells are born. We are living!