8. The brain uses over a quarter of the oxygen used by the human body.
9. The brain of an adult human weighs about 1.5 kilograms. Although it represents only 2% of its body weight, it uses about 20% of its energy.
10. If you smoothed all the wrinkles in your brain, it would lie flat the size of a pillowcase.
12. Grouping human blood groups can be a difficult process and there are currently about 30 recognized blood groups (or blood groups). You may be familiar with the simpler “ABO” system, which classifies blood groups under O, A, B and AB.
13. When you listen to music, your heartbeat will synchronize with the rhythm.
14. A healthy adult human heart beats an average of about 75 times in a minute.
15. In a year, a human heart would pump enough blood to fill a pool
16. If all the blood vessels in the human body were placed end to end, they would circle the Earth four times.
17. The skin is the largest organ of the human body
18. The outer layer of the skin is the epidermis, it is found thickest on the palms and soles of the feet (thickness of about 1.5 mm).
19. A large amount of dust in your home is actually dead skin. People shed about 600,000 skin particles every hour.
20. People have a stage of sleep that has rapid eye movement (REM). REM sleep accounts for about 25% of the time
total sleep and is often the time when you have the most vivid dreams.
21. A gene lives about 150 days before it falls.
22. The smallest bone found in the human body is located in the middle ear. The staple bone (or stirrup) is only 2.8 millimeters long.
23. The femur (thigh bone) is the longest bone in the human body.
24. In addition to having unique fingerprints, people also have unique fingerprints.
25. Chicken skin has evolved to make our ancestors’ hair stand on end, making them look more threatening to predators.
26. Humans are the only animals with a chin.
27. Redness is caused by an adrenaline rush.
28. The cornea is the only part of the body without blood supply – it gets oxygen directly from the air.
29. The human body contains enough fat to make seven bars of soap.
30. Between birth and death, the human body goes from having 300 bones to only 206.
31. The small intestine is about 23 meters long.
32. A medium-sized man eats about 33 tons of food during his lifetime, which is about the weight of six elephants.
33. Nephrons, kidney filtration units, clean the blood from the human body in about 45 minutes and send about six cups of urine (2000 ml) into the bladder daily.
34. A quarter of your bones are standing.
35. You can’t breathe and swallow at the same time.
36. An ordinary person produces enough saliva during life to fill two pools.
37. There are about ten thousand taste buds in human language and, in general, girls have more taste buds than boys!
38. While awake, your brain produces enough electricity to power a light bulb.
39. The left side of the brain controls the right side of the body and the right side of the brain controls the left side of the body.
40. In terms of camera, the human eye is about 576 megapixels.
41. Our brain is programmed to lift the inverted image formed on the retina by the convex lens of the eye. A newborn sees the world upside down until his brain begins to lift it.
42. Carry, on average, about four kilograms of bacteria around your body.
43. 50% of the power of your hand comes from the little finger.
44. Sometimes the pain caused by scratches causes the body to release the chemical serotonin that fights the pain.
45. As people get older, their skin becomes thinner, drier and less elastic, so wrinkles begin to appear.
46. An adult skin weighs between 3 and 4 kg.
47. If you stretch your skin, it would measure about 20 square meters in size, about the same size as a child’s bed sheet.
48. The diaphragm, which is a thin membrane under the lungs, sometimes swells, causing a sudden supply of air, which is interrupted by closing the neck. This is what we call hiccups.
49. In case of injury under the skin, the blood vessels rupture and spread to the tissues near the injury. The dark color of the blood appears through the skin as bruises.
50. A flowing nose is the way our body removes germs from the nose as we catch a cold and flu.
51. On average, the human body contains enough iron to make a 2.5 cm (1 inch) long nail.
Source: DoctorulZilei by www.doctorulzilei.ro.
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