15 facts about the human body
• 15 facts about the human body
1. Nerve impulses in the human body moves at a speed of approximately 90 meters per second.
2. Nearly half of all human bones are located in wrists and feet.
3. hit his head against the wall, you can lose 150 calories per hour.
4. The body of an adult of about 75 kilometers of nerves.
5. Every two weeks a new layer needs stomach mucus or it will begin to digest itself.
6. Your stomach produces a corrosive acid. Each of us has a liquid that any airline would not be allowed to take with you on board. But to get us to part with it is impossible, because it is produced by our stomachs. stomach cells produce hydrochloric acid. Yes, the same one that is used in metallurgy. It can damage the steel, but the mucosal surface of the stomach wall keeps us alive, and the acid causes work to break down food. Human gastric juice contains 0, 4% hydrochloric acid (HCl).
7. The human brain generates per day more electrical impulses than all telephones of the world combined.
8. Since its birth in the human brain is already there are 14 billion cells, and this number is until death does not increase. Haprotiv, after 25 years, it is reduced to 100 thousand per day. One minute you spend on the page reading, die about 70 cells. After 40 years of brain degradation is accelerated sharply, and after 50 neurons (nerve cells) and shrink the volume of the brain decreases. 9. In Mesopotamia for the death of the patient's physician, who treated him were executed, and for blindness - blinded.
10. Bones are depleted, helping to maintain a balance of minerals. Our bones besides the obvious work in support of the ground of all the organs and muscles and perform more difficult task of regulation of calcium levels. The bones contain calcium and phosphorus. And calcium, in turn, not least the needs of muscles and nerves. If it is not to be missed, special hormones will cause bones to "share" of calcium from other parts of the body.
11. Thousands of eggs are not used. Upon reaching the age of a woman about 50 years, the monthly menstrual cycle, which controls hormone levels and cooking an egg for fertilization, comes to naught. The ovaries produce less estrogen, causing physical and emotional changes. On average, a woman for life produced 34 000 eggs, of which only about 350 reach maturity (an average of about one per month).
12. Cilia output mucus. Most cells in our body have a hair-like organelles called cilia (or flagella). They play an important role in many bodily functions from digestion to hearing. But the cilia in the nose help to carry out the mucus from the nasal cavity to the throat. Cold weather slows down the process, which can lead to the accumulation of mucus in the nasal cavity. And runny nose.
13. Your skin four color. Any skin without pigmentation is white. Subcutaneous vessels add a little red. Yellow pigment adds hue. A sepia melanin colors created in response to exposure to ultraviolet radiation, up to black in the case of too much production. It is these four colors in different proportions and create a different color of people on Earth.
14. More Brain - fewer teeth. Evolution is not perfect. If she were alone, perhaps we would have wings instead of wisdom teeth. Sometimes useless functions remain in the body because no harm. But wisdom teeth were not always the only way to help dentists material. Once upon a time they were the third set of molars for chewing meat. But with the growth of the jaw brain structure changed, leaving us as a result of a few absolutely useless teeth.
15. The human body is longer in the morning, so we have higher than in the evening. This is due to the fact that during sleep in a horizontal position intervertebral discs saturated with fresh fluid, and relax back muscles. So in the morning you are a centimeter and a half higher than in the evening. During the day the wheels again compressed, the fluid of which is gradually emerging, and our growth is reduced again ... until the next morning.