Amazing facts about Human Body (100% real)

1. Your body is made of about 7 octillion atoms.

2. Your mouth produces about one liter of saliva each day.

3. The largest cell in the human body is the female egg and the smallest is the male sperm.

4. Stomach acid can dissolve metal.

5. Your eyes are always the same size from birth, but your nose and ears never stop growing.

6. Your skin’s outer layer sheds every 2-4 weeks, amounting to roughly .07 kilograms of dead skin in a year.

7. While the brain is the tool we use to detect pain, the brain itself cannot feel pain. 

8. The notion that we only use ten percent of our brain is untrue. We use virtually every part of our brain and most of it is active almost all of the time.

9. While the four major blood types are most common, there are actually 29 recognized blood groups! One of the rarest is the Bombay blood group, which is found in tribal populations of India.

10. Your brain is sometimes more active when you’re asleep than when you’re awake.

11. Cells in the inner lens of the eye, muscle cells of the heart, and the neurons of the cerebral cortex are the only cells that will be with you for the entirety of your life.

12. One square centimeter of your skin contains around a hundred pain sensors.

13. The heart has its own electrical supply and will continue to beat when outside the body.

14. Laid end to end, an adult’s blood vessels could circle Earth’s equator four times!

15. If you were to spread out all the wrinkles in your brain, it would be about the size of a pillowcase.

16. When you were born, you had 300 bones. As an adult, you have 206. Don’t worry, the other bones have not disappeared, they have merely fused together.

17. Believe someone when they tell you that you look radiant. Bodies actually give off a tiny amount of light that’s too weak for the eye to see!

18. The word “muscle” comes from Latin term meaning “little mouse“, which is what Ancient Romans thought flexed bicep muscles resembled.

19. You spend 10 percent of the day blinking.

20. Before the invention of the stethoscope, doctors had to press their ears directly on each patient’s chest.

21. Your eyes can distinguish between 2.3 and 7.5 million different colors.

22. They may cry constantly, but babies don’t shed tears until they’re at least one month old.

23. Your nose can differentiate between 1 trillion different smells.

24. Evidence of heart disease has been found in 3,000-year-old mummies.

25. Your skull is made up of 29 different bones.

26. Your blood makes up about eight percent of your body weight.

27. Teeth are the only part of the human body which cannot heal themselves.

28. A newborn child can breathe and swallow at the same time for up to seven months.

29. When you look at an object, the image of that object appears upside down on your retina. Your brain automatically corrects for this, allowing you to perceive the object the right side up.

30. Humans are the only species that produce emotional tears.

31. Every cell in the body gets blood from the heart except for the corneas.

32. Heart cancer is extremely rare because heart cells stop dividing in early life.

33. A man named Charles Osborne hiccupped for a total of 68 years.

34. Your pinky finger is small, but mighty. Without it, you would lose 50% of your hand’s strength.

35. A single human brain generates more electrical impulses in a day than all the telephones of the world combined.

36. A fetus acquires fingerprints at the age of three months.

37. Your heart beats 100,000 times per day, pumping 5.5 litres per minute, which adds up to about 3 million litres of blood a year and three billion beats in a lifetime.

38. 99% of the calcium contained in the human body is in one’s teeth and bones.

39. Human decomposition begins around 4 minutes after death, a process known as ‘self-digestion’ where your enzymes and bacteria eat you away.

40. As you read this sentence, 50,000 cells in your body died and were replaced by new ones.

41. NFL players are three to four times more likely to contract Alzheimer’s disease, Parkinson’s disease and Lou Gehrig’s disease than an average American. A study found that players in speed positions like wide receivers and running backs were three times more likely to develop neurodegenerative disease than players in non-speed or lineman positions.

42. Heart disease kills more people per year than cancer, war, terrorism, hunger, suicide, diabetes, respiratory diseases and mental disorders combined.

43. Your left lung is about 10 percent smaller than your right one.

44. It always helps to “let it out”. Crying decreases the feelings of anger or sadness.

45. Cancers are primarily environmental diseases with 90-95% of cases attributed to environmental factors and 5-10% due to genetics.

46. The liver is perhaps the most resilient of the major organs. It can regenerate from only 25% of its tissue mass. It will even grow to be just the right size for the body it’s in.

47. Three to five pounds of your body is made up of bacteria. Between 100 million to 1 billion bacteria can grow on each tooth.

48. There is a disease called anti-NMDA receptor encephalitis, caused when the body’s immune system goes haywire and attacks a protein in the brain. Some speculate anti-NMDA receptor encephalitis could be behind historical descriptions of what was believed to be demonic possession.

49. A woman’s heartbeat is, on average, faster than a man’s by almost eight beats a minute.

50. In terms of compression strength, the femur bone of a person weighing 83kg with size 11 feet could withstand the weight of 16,000 people standing on it at one time.

51. Human teeth are just as strong as shark teeth. They definitely have us beat in sharpness however!

52. Contrary to what they told you in high school, alcohol does not kill brain cells. What excessive alcohol consumption can do is damage the connective tissue at the end of neurons.

53. Synesthesia is a condition that causes senses to overlap which means that some people can hear the sound of colors or taste certain words.

54. The longest beard measures 7 feet 9 inches and belongs to Sarwan Singh of Canada.

55. If all the DNA in your body were uncoiled, it would stretch out to about 10 billion miles, which is the distance from Earth to Pluto and back.

56. Humans are the only species known to blush. When you blush, the lining of your stomach does too!

57. If you had a few too many drinks and can’t remember what you did last night, it’s not because you forgot. While you are drunk, your brain is incapable of forming memories.

58. More germs are transferred by shaking hands than kissing.

59. The strongest bone in the body is the femur, which is 48cm long and so strong that it can support 30 times the weight of an average man.

60. The first heart cell starts to beat as early as 4 weeks.

61. The average small intestine is about 23 feet long.

62. Human brains have gotten significantly smaller over the past 10-20,000 years. The lost volume is equivalent to the size of a tennis ball.

63. An average male produces more than 500 billion sperm cells in his lifetime.

64. Fingerprints increase friction and help grip objects.

65. The number of heart attacks peaks on Christmas Day.

66. Brain cells cannibalize themselves as a last-ditch source of energy to ward off starvation.

67. The indent under your nose, called the philtrum, is a residual reminder of your time in the womb. In utero, the two sides of your face develop independently, then join at the middle. When the two sides fail to fuse properly, the result is a cleft palate.

68. In a typical group of 50 African monkeys, there are more genetic variations than in the entire human race.

69. If the human eye were a digital camera, it would have 576 megapixels. That’s better than any camera on the market! An eye can distinguish about 10 million different colors.

70. Studies show that people with a high IQ dream more often and vividly.

71. The brains of introverts and extroverts are noticeably different. In the brains of extroverts, MRIs reveal that the dopamine reward network is more active. Introverts display more gray matter.

72. There is enough iron in a body to make a metal nail measuring up to three inches long.

73. The first pacemakers for the heart had to be plugged into a wall socket.

74. Over 50% of the dust in your home is actually dead skin.

75. Ninety minutes of sweating can temporarily shrink the brain more than one year of aging does.

76. It IS possible to sneeze with your eyes open, but in most cases your body’s response to blink kicks in.

77. When a pregnant woman experiences some kind of an organ damage (a heart attack, for example), the fetus can help with the recovery process as it sends stem cells to the damaged area.

78. It takes up to 6 months for babies to develop their permanent skin tone.

79. You are about 1 centimeter shorter at night. This is because the cartilage between your bones is compressed throughout the day.

80. Lung cancer is the world's most killing cancer. It claims about 1.2 million victims a year. Experts say around 90 percent of lung cancer cases are due to tobacco smoking.

81. Allergies are the result of your immune system reacting to a false alarm. When you experience an allergic reaction, your immune system is responding to a harmless allergen that it perceives as a threat.

82. Humans have more brain cells at the age of two than at any other point in their lives, but it takes nearly 20 years for the brain to mature.

83. A pumping human heart can squirt blood 10 yards.

84. The cracking sound made by knuckles, necks, backs, and other joints is that of bubbles popping in the joints’ fluid.

85. Human feet have 500,000 sweat glands and can produce more than a pint of sweat a day!

86. The muscles of the eyes used to focus move around 100,000 times a day. To get the same workout with your leg muscles, you would need to walk 50 miles every day.

87. If the lining of epithial cells which produce mucus were to disappear from your stomach, your stomach would digest itself.

88. Every single person has an individual, unique smell. Identical twins, however, share the same smell.

89. Research has found that emotional content of music and the listener’s personal attachment to music can influence pupil dilation.

90. From 1991 to 2000, the average weight of Americans increased by 8.5 pounds.

91. It is not possible to tickle yourself. The brain can predict sensations when your own movement causes them but not when someone else does. Go ahead, try it!

92. Your brain is 73% water. It takes only 2% dehydration to affect your attention, memory and other cognitive skills.

93. The typical human sneeze travels at just under 40 mph. It can almost outrun a tiger!

94. Your olfactory sensory organs shut down during REM sleep. That means that any smell that would normally stimulate a reaction isn’t going to do a thing during sleep… including smoke. Now would be a good time to check the batteries in your smoke alarm!

95. Your body produces enough heat in only thirty minutes to boil a half-gallon of water.

96. Like fingerprints, every human tongue has a unique tongue print. Furthermore, every person has a unique set of teeth. Not even identical twins share that similarity!

97. Your appendix is basically useless. While it does produce some white blood cells, most people are fine with an appendectomy.

98. Humans have the most endurance when it comes to longdistance running. Thousands of years ago, we used to run after the prey to hunt until they no longer had energy to continue.

99. Babies in the womb grow 8,000 new brain cells every second. Newborn babies can recognize their mother’s face after just a few hours.

100. A foreskin, the size of a postage stamp, from circumcised babies takes only 21 days to grow skin that can cover four football fields. The laboratory-grown skin is used in treating burn patients.