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 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. 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 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 brain circulatory system. The brain occupies only 2% of body weight, but consumes more oxygen than any other organ - so it is dramatically affected by a 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. This may be true, but don't think you're stupid if you can't remember your dreams. Most people do not remember what they dream, and the average length of a dream is only 2-3 seconds - quite enough to understand that you are seeing something.
7. Neurons continue to grow throughout a person's life. For many years, scientists and doctors thought that the brain and nerve cells could not 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 with at different speeds. 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, 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 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. We don’t fully know why, 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 fingers.
16. There is as much hair on a square centimeter of your body as 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 go through different haircuts and modifications - and some even had 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 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 so cleverly twisted, 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, it is necessary high 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 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 human lung 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 microscopic capillaries, along which oxygen and carbon dioxide. Large area 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 attacks that 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 almost equal to the diameter of a 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.

Body 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 important role during digestion 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 may be 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 the root one, and sometimes this extra tooth, which soon drops 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 are better at identifying citrus, vanilla, cinnamon and coffee aromas. 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 who perform delicate work, can't stand 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 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 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 is 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 heart attack happens 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 live for a month and in some cases even two without food, maintaining strength with the fat accumulated in the body. Without sleep people worry psychological changes- and this is after just a few days without sleep. Most long term wakefulness - 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. Human head remains conscious for 15-20 seconds after being 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 down.

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 bones of children must subsequently fuse together - for example, some bones in 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 shrinks 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. Tooth - the only organ, incapable 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. This sounds like a lot, but in reality it is 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 see more pleasant dreams, take better cover.
91. Tears and mucus contain the enzyme lysozyme, which destroys the cell walls of 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 on the energy we expend just to maintain constant temperature body, 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 on the entire 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 studied human organ. There is a lot we don't know about him, but nevertheless, here are some facts about him.

1. Nerve impulses move at a speed of 270 km/h.
2. The brain requires as much energy to function 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. The brain is much more active at night 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. 80% of the brain consists of water.

Hair and nails
In fact, these are not living organs, but remember how women 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 such facts, she will probably appreciate it.

11. Hair grows faster on your face 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. Human hair can bear 100g weight.
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 human hair is 3-7 years.
20. You need to be at least half bald for it to become noticeable.
21. Human hair is practically indestructible.

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 the small intestine.
23. The human heart creates pressure that is enough for blood to spray 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 a human lung 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 the diameter 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 move on with your life.
33. The adrenal glands change size throughout human life.

Body 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 sneezing 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 the size of a softball.
38. Approximately 75% of human waste 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. Over the course of a lifetime, a person produces so much saliva that it can fill a couple of swimming pools.
41. The average person passes gas 14 times a day.
42. Earwax is essential for healthy ears.

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. Perhaps you didn't know a few things about them.

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

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

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

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.
61. By the age of sixty, most people have lost about half of their taste buds.
62. Eyes remain the same size throughout your life, but your nose and ears grow throughout your life.
63. At age 60, 60% of men and 40% of women will snore.
64. 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.

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

65. Most often, heart attacks occur on Monday.
66. People can go much longer without food than without sleep.
67. When you sunburn, it damages your blood vessels.
68. 90% of diseases occur due to stress.
69. A human head remains conscious for 15-20 seconds after it is 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 tense 17 muscles to smile and 43 to frown. If you don't want to strain your face, smile. Anyone who often walks around with a sour expression for a long time knows how hard it is.
71. Children are born with 300 bones, but adults have only 206.
72. In the morning we are a centimeter higher than in the evening.
73. The strongest muscle of the human body is the tongue.
74. The heaviest bone in the human body is the jaw.
75. To take a step, you use 200 muscles.
76. The tooth is the only organ incapable of regeneration.
77. Muscles shrink twice as fast as they build.
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 things that you cannot 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. Humans lose about 600,000 pieces of skin 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.
87. The most common blood type in the world is first.
88. 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 higher the likelihood that you will 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. Your ears produce more earwax when you are afraid.
93. You can't tickle yourself.
94. The distance between your arms outstretched to the sides is your height.
95. Man is the only animal that cries because of emotions.
96. Right-handers live on average nine years longer than left-handers.
97. Women burn fat slower than men - by about 50 calories per day.
98. The pit between the nose and lip is called the nasal philtrum.

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. It is therefore natural that body parts and normal bodily functions may surprise us. From sneezing to growing nails, here are 100 of the strangest and most interesting facts about the 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.

Hair and nails
In fact, these are not living organs, but remember how women 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 such facts, she will probably appreciate it.

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.

Body 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.

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. Perhaps you didn't know a few things about them.

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

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

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

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 things that you cannot see with the naked eye.

Miscellaneous
A couple more interesting facts

Skin is the largest organ of our body. It provides us with protection, allows us to feel peace and is the first to report diseases. This is the “face” of our body, but we don’t know much about it.

Largest organ

Skin is the largest organ human body. The average surface area is from 1.5 to 2 square meters. On different areas The skin of the body varies in thickness and sensitivity. The thickest skin is on the feet and palms, the thinnest is on the eyelids. At the same time, skin sensitivity is not directly dependent on thickness. Thus, the skin on the fingers and palms, although quite thick, can feel a pressure of 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, the weight of our skin makes up 16% of our total body weight. So the excuse “I have heavy bones” can be safely replaced with the phrase “I have heavy skin.”

Skin that renews itself

Human skin is constantly renewed. This process is called regeneration. It happens like this: new skin cells are formed in the germinal layer of the epidermis, over the course of about 28-30 days they move to the surface and lose their cell nucleus. On the surface, with the help of the keratin they contain, they form the stratum corneum of the skin, which gradually peels off when washed or in contact with clothing. Thus, the skin that we consider ours is constantly renewed. After a month, the composition of a person’s skin completely changes. In newborns, the regeneration process, like many other processes (for example, metabolism), proceeds faster. “Skin change” in infants takes three days - 72 hours.

Goosebumps

When we are cold, scared, or when we are listening good music, then, as is known, so-called goosebumps may appear on the body.

This is a rudimentary reaction of the body, which we inherited as a “bonus” from our distant ancestors.

Once upon a time, it helped them warm up and made them more convincing in the eyes of the enemy. When necessary, tiny muscles throughout the body tense and “raise the hairs on end.” With thick fur, this gives the skin 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, a festival was held in the castle of the Duke of Milan, Louis Moreau, at which the naked son of a baker, painted in gold, appeared before the audience as a symbol of the coming Golden Age. Everything would have been fine, but the performance had to be stopped due to the illness of the Duke’s wife. They simply forgot about the boy. He stayed in the castle the whole night. Leonardo da Vinci found him in the morning, 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 because his skin could not “breathe”, which is why 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 body’s thermoregulation, due to hypothermia, since the paint dilated the capillaries and they could not retain heat. Conclusion: don’t 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 dermatology health center in Chicago, hyperpigmentation of the skin in the creases of the neck, especially in older people, may indicate diabetes mellitus, and too dry or moisturized skin (if this has not been observed before) – o possible violation functions of the thyroid gland.

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

Wrinkled fingers

Anyone who has ever taken a bath or simply been in water for quite a long time has noticed how the skin on the fingers and toes wrinkles. This phenomenon is directly related to the water permeability of our skin, which is provided by 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, the extracellular layer of fat becomes thinner, the water gains access to the skin cells and swells. This process does not represent anything 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 loses up to 30,000 dead skin cells.

Over the course of a lifetime, every person loses at least one hundred kilograms of “old skin.”

Millions of tons of dead horny cells of our epidermis are released into the atmosphere. It is also interesting that white skin appeared in humans not so long ago, about 20-50 thousand years ago. This happened due to the loss of part of the melanin pigment by people migrating to the North. But still the percentage of people with white skin lacking melanin (albinism) is extremely low. Only one in 110,000 people is an albino.

Skin is a great worker

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

Layers of skin

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 area; the total area of the skin of an adult can reach 2 square meters.

Skin consists of three layers. The top one is the epidermis. The lower layers of the epidermis produce melanin, the pigment that determines skin color. There are also constantly dividing cells that 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 a person’s natural passport. This property is used by criminologists when studying the fingerprints of criminals.

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

Nerve endings on 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. On the skin of a modern person there are 2 million receptors, of which 1.5 million are pain receptors, the rest of the receptors react to pressure, heat, cold, and just touch.

The cheeks have the fewest pain receptors - this is the most insensitive area of the skin. The most receptors are on the skin of the tongue and fingertips.