Interesting facts about the human body. Incredible facts about the human body

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 more than one hundred years. Therefore, it is only natural that our body parts and normal bodily functions may surprise us. From sneezing to fingernails growing, here are 100 of the weirdest, wackiest and most interesting facts about human body.

Brain

The brain is the most complex and least understood human organ. There's a lot we don't know about him, but here are a few facts about him nonetheless.

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 vice versa. They provide responsiveness and rush at the speed of an expensive sports car.
2. The brain requires the same amount of energy to work as a 10-watt light bulb. The overhead lightbulb cartoon trick isn't all that unreasonable. Your brain needs as much energy as a small light bulb - even when you are sleeping.
3. Cage human brain can store five times more information than any encyclopedia. Scientists have not agreed on the memory capacity of the human brain, but it fits somewhere between three and a thousand terabytes of information. For example, the National Archives of Britain with its 900-year history takes up only 70 terabytes, so evaluate the reserves of your brain!
4. The brain uses 20% of all oxygen that enters circulatory system. The brain occupies only 2% of body weight, but consumes more oxygen than any other organ - therefore, it is sharply reflected in the lack of oxygen. So breathe deeply!
5. At night, the brain is much more active than during the day. It would be logical to assume the opposite: after all, during the day we perform various activities, think, communicate - and this requires more energy than just lying in bed. But it turns out, everything is completely different. When you turn off, your brain turns 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. Maybe it is, but don't think you're a fool if you can't remember your dreams. Most people do not remember what they are dreaming about, and the average length of a dream is only 2-3 seconds - enough to understand that you are seeing something.
7. Neurons continue to grow throughout a person's life. For years, scientists and doctors have thought that the brain and nerve cells cannot grow and regenerate. Of course, they do not do this as intensively as other tissues, but they grow throughout life, adding more and more scope for studying the brain and the diseases that affect it.
8. Information passes through different neurons with different speed. Not all neutrons are the same. There are several types nerve cells, and the speed of information passing 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, your brain will give you a signal that something is wrong with it, and you will feel pain. And the brain itself does not hurt. The head may hurt: there are many blood vessels and nerves that cause pain.
10. The brain is 80% water. The brain is not a solid gray mass, as they show on TV. Living brain tissues are soft, pink and jelly-like due to blood flow and high content fluids in tissues. So the next time you get thirsty, don't put it off too long: your brain is suffering!

Hair and nails

In fact, these are not living organs, but remember how your friends are shaking over 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 surely appreciate it.

11. Facial hair grows faster than anywhere else. You probably guessed this when you shaved in the morning, and in the evening you were already overgrown with bristles. If a man did not shave, his beard would grow up to seven and a half meters in his life! But that's too much, right? 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 not in the process of baldness - then, of course, he falls out even more hair. The amount of hair falling out depends on the season, health, diet, age, and for girlfriends, it also depends on pregnancy.
13. Diameter female hair half that of men. It will seem strange, but it is quite logical: male hair thicker than women. The thickness of the hair also depends on the race.
14. A human hair can support a weight of 100g. That's half a glass of something, by the way! And if the hair is all together, then somehow I even believe in the story of Rapunzel.
15. The nail on the middle finger grows faster than the others. And the nail on the middle finger of the leading hand is generally a champion in growth rate. Why, we do not fully know, but the growth rate of the nail is somehow related to the length of the finger, so the nails grow fastest on long fingers, and the 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 thin for us to see.
17. Blondes have more hair. Hair color determines their density on the head. The average person has 100,000 hair follicles, from each can grow 20 hairs in a lifetime. Blondes have 146,000 hair follicles, while brunettes have about 110,000. Brown and fair-haired people have just an average of 100,000, and redheads have about 86,000.
18. Fingernails grow about 4 times faster than toenails. You have probably noticed that you cut your fingernails more often, so everything is logical. They are used more often, the fingers are longer - that's 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 enough hair every day, they live a long time. They managed to visit different haircuts and modifications - and some of them even had different colors!
20. You have to be at least half bald for it to be noticeable. You lose 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 is halved.
21. human hair practically indestructible. Yes, they burn well, but they are generally difficult to destroy. Ever wondered what clogs your pipes? Hair is not affected by cold, climate change, water and other natural forces and they are resistant to many types of acids and harsh chemicals.

Internal organs

We do not remember the internal organs until they bother us, but it is thanks to them that we can eat, breathe, walk and all that. Remember this the next time your stomach rumbles.

22. The largest internal organ - small intestine. Despite the fact that it is modestly called thin, it is really big: its length is four times the average human height. If it weren't so cleverly twisted, it wouldn't fit in the abdominal cavity.
23. human heart creates pressure that is enough to spurt blood seven and a half meters forward. Therefore, it is understandable why it is so easy to feel the heartbeat. In order for blood to pass through the body quickly, it is necessary great pressure, which occurs as a result of strong contractions of the walls of the ventricles, pushing blood.
24. The acid in your stomach can dissolve razor blades. You should not check this and there are 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 there will be more.
26. Your stomach is completely renewed every 3-4 days. The muscular walls of the stomach would quickly dissolve all the same hydrochloric acid, if not regenerated so quickly. Guys with heartburn know how frustrating it is when you feel the effects of acid on you.
27. The surface area of human 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 bronchial branches and tiny alveoli, shaped like bunches of grapes. They are filled 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. In general, the hearts of men and women work differently - for example, treatment regimens for a heart attack that work for men, in the cases of women, are ineffective.
29. Scientists say that the liver has more than 500 functions. You never think about your liver - except for a hangover morning, and by the way, this is one of the biggest, busiest organs that work a lot. Some of the functions of the liver are: production of bile, breakdown of red blood cells, and detoxification.
30. The aorta has a diameter almost equal to that of a garden hose. The human heart is about the size of two fists on average, 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 about the same size. They are about 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 hustle.
32. You can remove most of the internal organs and live on. The human body seems fragile, but you can live without a stomach, a spleen, 75% of the liver, 80% of the intestines, one kidney, one lung, and almost every organ located in the pelvic and inguinal cavity. Of course, it is unlikely that you will be like a pickle, but it will not 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 be barely noticeable.

Organism's functions

We don't really like to talk about them, but we have to deal with them daily. Here are some facts about not the most 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: air is rushing out of your nose at a tremendous speed! So it makes sense to cover up.
35. The speed of coughing can even reach 900 km/h. The contagion spreads throughout the office or classroom - woo, rubbish! After all this, flu epidemics are no surprise.
36. Women blink twice as often as men. You blink many times every day. On average - 13 times per minute.
37. Full bladder up to 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 between 400 and 800 ml of fluid, but most people begin to want to go to the toilet when it contains somewhere around 250-300 ml.
38. Approximately 75% of human life products consist of water. Rejoice in this! The drier the stool, the more painful the process of getting rid of it.
39. There are approximately 500,000 people on their feet sweat glands, they can produce up to a liter of sweat a day! Now I understand why these shoes stink so much. Men also sweat much more than women.
40. In a lifetime, a person produces so much saliva that it can fill a couple of pools. saliva plays important role during digestion and keeps the mouth clean.
41. On average, a person releases gases 14 times a day. Even if you think you're too good for it, the reality is that you fart several times a day. Digestion causes the body to release gases, there is no escape from this.
42. Earwax is essential for ear health. Many people think that she is disgusting, but in fact it is important thing for the health of your ears. It protects the sensitive inner ear from bacteria, dirt and even insects. It also lubricates and cleans the ear canal.

Sex and procreation

Sex is largely taboo, but a very important part of human life and relationships. Procreation is no less important. You may not have known a few things about them.

43. Every single day in the world there are 120 million sexual acts. 4% of the world's population has sex every day, and the birth rate continues to rise worldwide.
44. The largest human cell is the egg, and the smallest is the sperm. You can't see skin cells or muscles, but an egg is big enough to see with the naked eye: it's about a millimeter in diameter. A male spermatozoa on the contrary, are tiny.
45. During the first trimester of pregnancy, women most often dream of frogs, worms and plants. Hormones during pregnancy can cause mood swings and all sorts of other unexpected things. They can even affect dreams! And many women during pregnancy see water, childbirth and erotic scenes in a dream.
46. Your teeth begin to grow six months before you are born. Rare babies are born with teeth, but teeth nevertheless 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 melanin pigment. Melanin in a newborn's eyes often takes time to either fade when exposed to light, or to show up and show the baby's true eye color.
48. Children are strong as bulls. Sure, they can't pull a cart, but if they were the size of a bull, they certainly could. They are very strong for their tiny size. So be careful: they kick!
49. One in 2,000 babies is born with a tooth. Sometimes it's normal baby tooth, which will remain with the child until it is replaced by the root, and sometimes it extra tooth, which will soon drop out.
50. The fetus acquires fingerprints at the age of three months. More on early stages development in the fetus appears one of the most unique human traits - fingerprints. At 6-13 weeks of development, they already take on a clear outline. Oddly enough, these prints will not change throughout life and will be one of the last things to disappear after death.
51. Each person for half an hour of his life was a single cell. Even the largest of us were once a single cell - a zygote fertilized by an egg. Soon she began to divide and develop into an embryo.
52. Most men get an erection every hour and every hour and a half during sleep.: after all, at night the brain is much more active. Circulation and testosterone cause erections during sleep, a normal part of REM sleep.

Feelings

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

53. After a hearty meal, we hear worse. If you're going to a concert after good lunch You are doing yourself a disservice. Eat less so you can hear better.
54. Only one third of all people have one hundred percent vision. Glasses and contact lenses the other two-thirds wear - or they should. People with good eyesight is getting smaller.
55. If saliva cannot dissolve something, you will not feel the taste. To taste 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, the sense of smell is better developed in women than in men. Research has shown that women better than men feel odors. They better identify citrus, vanilla, cinnamon and coffee smells. And another 2% of people can't smell. At all.
57. The nose remembers 50,000 different scents. A bloodhound's nose may be a million times more sensitive than a human's, but that doesn't mean that the human sense of smell is no good. people can identify wide range fragrances, many of which are associated with their memories.
58. Pupils dilate even due to small interference. It is believed that this is why surgeons, watchmakers and other people performing fine work, do not tolerate noise. The sound causes their pupils to change focus, and they see worse, which makes them less able to do their job.
59. All people have their own unique smell - except for identical twins. Newborn babies smell their mother, and many of us smell our loved ones. Part of this smell is genetically determined, but it also depends on the environment, diet, hygiene products, etc.

Aging and death

We age throughout life - that's how it works.

60. The mass of ash 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 remains dry matter.
61. Hair and nails grow after death. They appear longer when a person dies because the skin dehydrates and recedes at the base of the nail and hair roots.
62. By the age of sixty, most people have lost about half of their taste buds. Maybe you shouldn't trust grandma to cook so much? Older people have a worse sense of taste - so they can oversalt, put more sugar, etc.
63. Your eyes are the same size all your life, but your nose and ears grow all your life. Children look 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, 60% of men and 40% of women will snore. If you've ever heard snoring, you know how loud it can be. Normal snoring is about 60 decibels, at the level of normal speech. And intense snoring reaches 80 decibels - it's like a jackhammer hitting concrete.
65. The head of a child 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 dimensions in different proportions than the body. The legs and torso are still growing, but the head is gone.

Diseases and injuries

We all get sick and injured. And that's pretty interesting too!

66. Most often heart attack happens on Monday. Monday is a hard day, a very bad day! A 10-year study in Scotland found that Mondays were 20% more likely to have heart attacks. Scientists believe that there is a combo of too cheerful weekends and too harsh start of the week.
67. People can go much longer without food than without sleep. You feel much more comfortable having fun all night than not eating, but this feeling is deceptive. If a person has enough water, he can live for a month and in some cases even two without food, maintaining his strength with fat accumulated in the body. Without sleep, people experience psychological changes- and this is after a few days without sleep. Most long term wakefulness - 11 days. The person who set this record, during the experiment, started talking, saw hallucinations and forgot what he was doing at all.
68. When you burn in the sun, it damages the blood vessels. They return to normal condition for 4-5 months. Keep this in mind the next time you're too lazy to put sunscreen on your face.
69. 90% of diseases 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. human head remains conscious for 15-20 seconds after being chopped off. Amazing Fact how strong the brain is to be able to stay alive without the rest of the body! Although the duration of this consciousness is different - 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 down.

71. You use 17 muscles to smile and 43 to frown. If you don't want to strain your face, smile. One who walks often and for a long time acid mine knows how hard it is.
72. Children are born with 300 bones, while adults have only 206. The reason is that many of the bones of children must subsequently fuse together - for example, some bones of the skull. Why don't they do it in the womb? This makes it easier for him to get through. birth canal. Bones grow together as children grow.
73. In the morning we are a centimeter higher than in the evening. The cartilage between our bones shrinks while we stand, sit and walk, so we shrink a little during the day.
74. The strongest muscle in 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 of the human body is the jaw bone. 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. Tooth - sole organ incapable of regeneration. So go to the dentist, he will not recover on his own.
78. Muscles deflate twice as slowly as they inflate. But that's no reason not to exercise! build up muscle mass relatively easy, so this should motivate you.
79. Some bones are stronger than steel. This doesn't mean bones don't break: they do. Steel is just heavier. Well, bone is a strong thing.
80. The feet contain a quarter of all the bones of the human body. Of the 206 bones in the human body, 52 are found in the legs.

At the cellular level

There are some things you can't 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. Therefore, it dries and peels off about once a month to maintain its strength. Most likely, the skin of your last month is still at home: it is dust on the bookshelves and under the sofa.
83. Every minute 3,000,000 cells die in the human body. It sounds like it's a lot, but it really isn't. In general, there are about 10-50 trillion cells in the body, so you can afford such losses.
84. People lose about 600,000 skin particles every hour. Don't think about it unless you're sunburnt. New cells immediately come to replace the old ones.
85. Every day the adult human body produces 300 billion new cells. Your body needs energy to keep your organs working and organized. desired condition to fix 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 6 cm nail out of it. Everyone who has tasted blood knows that it gives off iron. Here it is! And when it is too small, anemia develops.
88. The most common blood type in the world is the first. It is very useful because it can be transfused to people with a different blood type. The most rare group blood - the fourth.
89. The 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 more likely you are to have a nightmare. If you want to see more pleasant dreams take cover better.
91. Tears and mucus contain the enzyme lysozyme, which destroys the cell walls of many bacteria. This is to your advantage: mucus in the nose and throat, as well as tears, prevent diseases.
92. Half an hour your body releases as much energy as it takes to boil one and a half liters of water. So on the energy we expend just to maintain constant temperature body, enough to cook pasta.
93. Your ears emit more earwax when you're afraid. The chemicals and hormones that rise during fear have this strange effect.
94. You can't tickle yourself. It's just that the brain knows what you're going to do.
95. The distance between arms outstretched to the sides - this 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 an average of nine years longer than left-handers. This is not based on genetics, the fact is that all machines and tools are made for right-handers, so it is more dangerous for left-handers to work with them.
98. Women burn fat more slowly than men - about 50 calories a day. It's just that women are naturally destined to bear offspring, so there should be more fat in their body. And so it is harder for them to lose weight.
99. Koalas and primates are the only animals with unique fingerprints.
100. The hole between the nose and the lip has a name. Nasal groove. It is not clear why this is necessary, but the ancient Greeks even thought that this was one of the most sensitive erogenous zones on the whole body.

The human body is a very complex and intricate system that baffles doctors and researchers.
Even we are surprised by the functions of our own body and body parts.
Let's learn a little more about the human body from interesting facts.

Brain
The brain is the most complex and least understood human organ. There's a lot we don't know about him, but here are a few facts about him nonetheless.

1. Nerve impulses move at a speed of 270 km/h.
2. The brain requires the same amount of energy to work as a 10-watt light bulb.
3. A human brain cell can store five times more information than any encyclopedia.
4. The brain uses 20% of all oxygen that enters the circulatory system.
5. At night, the brain is much more active than during the day.
6. Scientists say that the higher the IQ level, the more often people dream.
7. Neurons continue to grow throughout a person's life.
8. Information passes through different neurons at different speeds.
9. The brain itself does not feel pain.
10. The brain is 80% water.

Hair and nails
In fact, these are not living organs, but remember how women are shaking over their nails and hair, how much money they spend on caring for them! On occasion, you can tell your lady a couple of such facts, she will surely appreciate it.

11. Facial hair grows faster than anywhere else.
12. Every day a person loses an average of 60 to 100 hairs.
13. The diameter of women's hair is half that of men's.
14. A human hair can support a weight of 100g.
15. The nail on the middle finger grows faster than the others.
16. There is as much hair on a square centimeter of a human body as on a square centimeter of a chimpanzee's body.
17. Blondes have more hair.
18. Fingernails grow about 4 times faster than toenails.
19. The average lifespan of a human hair is 3-7 years.
20. You need to be at least half bald for it to become noticeable.
21. Human hair is virtually indestructible.

Internal organs
We do not remember the internal organs until they bother us, but it is thanks to them that we can eat, breathe, walk and all that. Remember this the next time your stomach rumbles.

22. The largest internal organ is the small intestine.
23. The human heart creates enough pressure to send blood spurting seven and a half meters forward.
24. Stomach acid can dissolve razor blades.
25. The length of all blood vessels in the human body is about 96,000 km.
26. The stomach is completely renewed every 3-4 days.
27. The surface area of human lungs is equal to the area of a tennis court.
28. A woman's heart beats faster than a man's.
29. Scientists say that the liver has more than 500 functions.
30. The aorta has a diameter almost equal to that of a garden hose.
31. The left lung is smaller than the right - so that there is room for the heart.
32. You can remove most of the internal organs and live on.
33. The adrenal glands change size throughout human life.

Organism's functions
We don't really like to talk about them, but we have to deal with them daily. Here are some facts about not the most pleasant things that concern our body.

34. The speed of a sneeze is 160 km/h.
35. The speed of coughing can even reach 900 km/h.
36. Women blink twice as often as men.
37. A full bladder is about the size of a softball.
38. Approximately 75% of human life products consist of water.
39. There are approximately 500,000 sweat glands on the legs, they can produce up to a liter of sweat per day!
40. In a lifetime, a person produces so much saliva that it can fill a couple of pools.
41. On average, a person releases gases 14 times a day.
42. Earwax is essential for ear health.

Sex and procreation
Sex is largely taboo, but a very important part of human life and relationships. Procreation is no less important. You may not have known a few things about them.

43. Every single day in the world there are 120 million sexual acts.
44. The largest human cell is the egg, and the smallest is the sperm.
45. During the first trimester of pregnancy, women most often dream of frogs, worms and plants.
46. Teeth begin to grow six months before birth.
47. Almost all babies are born with blue eyes.
48. Children are strong as bulls.
49. One in 2,000 babies is born with a tooth.
50. The fetus acquires fingerprints at the age of three months.
51. Each person for half an hour of his life was a single cell.
52. For most men, an erection occurs every hour or every hour and a half during sleep: after all, at night the brain is much more active.

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

53. After a hearty meal, we hear worse.
54. Only one third of all people have one hundred percent vision.
55. If saliva cannot dissolve something, you will not taste it.
56. From birth, the sense of smell is better developed in women than in men.
57. The nose remembers 50,000 different scents.
58. Pupils dilate even due to small interference.
59. All people have their own unique smell.

Aging and death
We age throughout life - that's how it works.

60. The mass of ash of a cremated person can reach 4 kg.
61. By the age of sixty, most people have lost about half of their taste buds.
62. The eyes are the same size throughout life, but the nose and ears grow throughout life.
63. At 60, 60% of men and 40% of women will snore.
64. The head of a child 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.

Diseases and injuries
We all get sick and injured. And that's pretty interesting too!

65. Most heart attacks occur on Mondays.
66. People can go much longer without food than without sleep.
67. When you burn in the sun, it damages the blood vessels.
68. 90% of diseases are caused by stress.
69. The human head remains conscious for 15-20 seconds after being cut off.

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

70. You use 17 muscles to smile and 43 to frown. If you don't want to strain your face, smile. Anyone who walks around with a sour face often and for a long time knows how hard it is.
71. Children are born with 300 bones, while adults have only 206.
72. In the morning we are a centimeter higher than in the evening.
73. The strongest muscle in the human body is the tongue.
74. The heaviest bone in the human body is the jaw bone.
75. To take a step, you use 200 muscles.
76. Tooth is the only organ incapable of regeneration.
77. Muscles decrease twice as slowly as they pump up.
78. Some bones are stronger than steel.
79. The feet contain a quarter of all the bones of the human body.

At the cellular level
There are some things you can't see with the naked eye.

80. There are 16,000 bacteria per square centimeter of the body.
81. Every 27 days you literally change your skin.
82. Every minute 3,000,000 cells die in the human body.
83. People lose about 600,000 skin particles every hour.
84. Every day, the adult human body produces 300 billion new cells.
85. All tongue prints are unique.
86. There is enough iron in the body to make a 6 cm nail out of it.
87. The most common blood type in the world is the first.
88. The lips are red because there are many capillaries under the skin.

Miscellaneous
A couple more interesting facts

89. The colder the room where you sleep, the more likely you are to have a nightmare.
90. Tears and mucus contain the enzyme lysozyme, which destroys the cell walls of many bacteria.
91. In half an hour the body releases as much energy as it takes to boil one and a half liters of water.
92. Ears produce more earwax when you are afraid.
93. You can't tickle yourself.
94. The distance between arms outstretched to the sides - this is your height.
95. Man is the only animal that cries because of emotions.
96. Righties live an average of nine years longer than lefties.
97. Women burn fat more slowly than men - about 50 calories a day.
98. The fossa between the nose and the lip has a name - the nasal groove.

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 more than one hundred years. Therefore, it is quite natural that the parts of the body and the usual functions of the body can surprise us. From sneezing to fingernails growing, here are 100 of the weirdest and most interesting facts about the human body.

Brain
The brain is the most complex and least understood human organ. There's a lot we don't know about him, but here are a few facts about him nonetheless.

Hair and nails
In fact, these are not living organs, but remember how women are shaking over their nails and hair, how much money they spend on caring for them! On occasion, you can tell your lady a couple of such facts, she will surely appreciate it.

Internal organs
We do not remember the internal organs until they bother us, but it is thanks to them that we can eat, breathe, walk and all that. Remember this the next time your stomach rumbles.

Organism's functions
We don't really like to talk about them, but we have to deal with them daily. Here are some facts about not the most pleasant things that concern our body.

Sex and procreation
Sex is largely taboo, but a very important part of human life and relationships. Procreation is no less important. You may not have known a few things about them.

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

Aging and death
We age throughout life - that's how it works.

60. The mass of ash of a cremated person can reach 4 kg.
61. By the age of sixty, most people have lost about half of their taste buds.
62. The eyes are the same size throughout life, but the nose and ears grow throughout life.
63. At 60, 60% of men and 40% of women will snore.
64. The head of a child is a quarter of its height, and by the age of 25, the length of the head is only an eighth of the entire length of the body.

Diseases and injuries
We all get sick and injured. And that's pretty interesting too!

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

At the cellular level
There are some things you can't see with the naked eye.

80. There are 16,000 bacteria per square centimeter of the body.
81. Every 27 days you literally change your skin.
82. Every minute 3,000,000 cells die in the human body.
83. People lose about 600,000 skin particles every hour.
84. Every day, the adult human body produces 300 billion new cells.
85. All tongue prints are unique.
86. There is enough iron in the body to make a 6-centimeter nail out of it.
87. The most common blood type in the world is the first.
88. The lips are red because there are many capillaries under the skin.

Miscellaneous
A couple more interesting facts

Skin is the largest organ of our body. It provides us with protection, allows us to feel the world and is the first to report diseases. This is the "face" of our body, but we do not know much about it.

largest organ

Skin is the largest organ human body. Its average surface area is from 1.5 to 2 square meters. On different areas Body skin has different thickness and sensitivity. The thickest skin is on the feet and palms, the thinnest is on the eyelids. At the same time, the sensitivity of the skin is not directly dependent on the thickness. So, on the fingers and palms, the skin, although quite thick, can feel pressure from 20 milligrams, which corresponds to the average weight of a fly.

Skin weighs a lot

The skin is not only the largest human organ, but also the heaviest. On average, our skin makes up 16% of our total body weight. So the excuse "I have a heavy bone" can be safely changed to the phrase "I have a heavy skin."

Skin that renews

Human skin is constantly renewing itself. This process is called regeneration. It happens like this: new skin cells are formed in the germinal layer of the epidermis, for about 28-30 days they move to the surface and lose their cell nucleus. On the surface, with the help of the keratin contained in them, they form the stratum corneum of the skin, which gradually exfoliates when washed or in contact with clothing. Thus, the skin that we consider our own is constantly updated. After a month, the composition of human skin changes completely. In newborns, the regeneration process, like many other processes (for example, metabolism), proceeds faster. "Change of skin" in infants takes three days - 72 hours.

Goose pimples

When we're cold, scared, or when we're listening good music, then on the body, as you know, so-called goosebumps may appear.

This is a rudimentary reaction of the body, inherited by us as a "bonus" from our distant ancestors.

Once upon a time, she helped them warm up and made them more convincing in the eyes of the enemy. When needed, tiny muscles throughout the body tense up and “raise the hair on end.” With thick fur, this betrays the skin with good thermal insulation. For modern man this skill is useless.

The story of the golden boy

Many people know the story of the "golden boy". In 1496, in the castle of the Duke of Milan, Lodovik Moreau, a festival took place, at which, as a symbol of the coming Golden Age, the naked son of a baker, painted with gold paint, appeared before the audience. Everything would be fine, but the performance had to be stopped due to the illness of the duke's wife. The boy was simply forgotten. He sat in the castle all night. In the morning Leonardo da Vinci found him, but the baker's son could not be cured, on the fourth day he died. This story is sometimes told with the following conclusion: the boy died from the fact that his skin could not "breathe", so he died. However, today it is already known that "skin breathing" is not dominant in saturating the body with oxygen, and the boy died due to a violation of the thermoregulation of the body, due to hypothermia, since the paint expanded the capillaries and they could not keep warm. Conclusion: do not get too carried away with body painting.

Skin is an indicator of health

If the eyes are the mirror of the soul, then the skin is the mirror of our body. Changes in the skin often indicate the presence serious violations and diseases.

According to the doctor medical sciences Brooke Jackson, director of dermatological health center in Chicago, hyperpigmentation of the skin in the folds of the neck, especially in older people, may indicate diabetes, and too dry or moisturized skin (if this has not been observed before) - o possible violation thyroid functions.

Not to mention the usual rash, which is the first symptom of many dangerous diseases.

wrinkled fingers

Everyone who has ever taken a bath or just been in the water for quite a long time, paid attention to how the skin on the fingers and toes wrinkled. This phenomenon is directly related to the permeability of our skin, which provides its outer layer. Its cells are in contact with each other and on outer surface have a layer of fat. If we stay in water for a long time, then the extracellular layer of fat becomes thinner, water gains access to skin cells and swells. This process is not critical for health.

Dust and albinos

It is a well-known fact that 2/3 of indoor dust consists of dead horny skin cells. Every minute our body sheds up to 30,000 dead skin cells.

For life, each person loses at least one hundred kilograms of "old skin".

Millions of tons of dead horny cells of our epidermis escape into the atmosphere. It is also interesting that White skin a person appeared not so long ago, about 20-50 thousand years ago. This happened due to the loss of part of the melanin pigment by people who migrated to the North. But until now, the percentage of people with white skin, devoid of melanin (albinism) is extremely low. Only one in 110,000 people is an albino.

Skin is a great worker

When talking about human organs, remember the heart, liver, but for some reason they forget about the skin. But human skin is the heaviest (weight 2-3 kg) human organ. The skin is a great worker, performing several functions at once. It protects the body from harmful influence environment- pathogens, harmful ultraviolet radiation and harmful chemical compounds. The skin is responsible for thermoregulation of the body. It removes from the body along with sweat harmful substances produces vitamin D, essential for life.

Skin layers

The thickest skin is on the feet (3-4 mm), the thinnest is on the scrotum (0.4 mm). By the way, the skin is also the largest organ in terms of area, the total area of the skin of an adult can reach 2 square meters.

The skin is made up of three layers. The uppermost is the epidermis. In the lower layers of the epidermis, melanin is produced - the pigment that determines skin color. There are also constantly dividing cells, which are gradually pushed to the surface of the epidermis and exfoliate due to friction of the skin against clothing and other objects.

Drawing skin

The dermis, pushing its papillae into the epidermis and lifting it, creates an individual pattern of the skin - this is the natural passport of a person. This property is used by criminologists, studying the fingerprints of criminals.

The lowest layer of the skin is fatty, it serves as a shock absorber that protects the internal organs from shocks and shocks. It is thickest in places that are constantly under pressure - the buttocks and the soles of the feet. Subcutaneous fat is also a reserve nutrients.

Nerve endings in the skin

Skin is the most ancient mechanism sensitivity. Exactly nerve endings on the skin of the first living creatures evolved into modern nervous system. There are 2 million receptors on the skin of a modern person, of which 1.5 million are pain receptors, the rest of the receptors respond to pressure, heat, cold, and just touch.

The least pain receptors on the cheeks - this is the most insensitive area of \u200b\u200bthe skin. Most receptors are on the skin of the tongue and fingertips.