Human Body Facts

The human body is a machine that is full of wonder. This collection of human body facts will leave you wondering why in the heck we were designed the way we were.

1. 50,000 of the cells in your body will die and be replaced with new cells, all while you have been reading this sentence! pretty cool
2. Your body requires 1000-1500 calories per day just to simply survive (breathing, sleeping, eating).
3. Some people have abnormalities of the inner ear that enhance their sensitivity to this component so much that the sound of their own breathing becomes overwhelming, and they may even hear their eyeballs moving in their sockets. Source

4. When you look at a clock, and the second hand seems to freeze for a moment, your brain is actually generating a false memory, and your perception of time stretches slightly backward. This effect is called chronostasis. Source

5. The brain itself cannot feel pain. While the brain might be the pain center when you cut your finger or burn yourself, the brain itself does not have pain receptors and cannot feel pain.
6. The average human body contains enough: Sulphur to kill all fleas on an average dog, Carbon to make 900 pencils, Potassium to fire a toy cannon, Fat to make 7 bars of soap, Phosphorus to make 2,200 match heads, and enough Water to fill a ten gallon tank
7. Your left lung is smaller than your right lung to make room for your heart.
8. The average human produces a quart of saliva a day or 10,000 gallons in a lifetime.
9. Every day an adult body produces 300 billion new cells.
10. In one hour, your heart works hard enough to produce the equivalent energy to raise almost 1 ton of weight 1 yard off the ground.
11. If your immune system received access to the inside of your eyes, it would attack and destroy them as invaders. Similarly, if you damage one of your eyes and it isn’t removed and stays in your eye socket your body will make antibodies against it, which will end up attacking and destroying your good eye. …and this sometimes happens. Source
12. Scientists say the higher your I.Q. the more you dream.
13. The largest cell in the human body is the female egg and the smallest it the male sperm.
14. You use 200 muscles to take one step.
15. You use an average of 43 muscles for a frown.
    You use an average of 17 muscles for a smile.
16. The average human's heart will beat 3000 million times in their lifetime.
    The average human will pump 48 million gallons of blood in their lifetime.
17. In 1 square inch of skin there lies 4 yards of nerve fibers, 1300 nerve cells, 100 sweat glands, 3 million cells, and 3 yards of blood vessels.
18. There are 45 miles of nerves in the skin of a human being.
19. Muscle cells live as long as you do while skin cells live less than 24 hours.
20. A fetus acquires fingerprints at the age of three months.
21. A full bladder is roughly the size of a soft ball.
22. You burn 26 calories in a one minute kiss.
23. Your brain operates on the same amount of power that would light a 10-watt light bulb.
24. There are 5 million hair follicles on an average adult.
25. The acid in your stomach is strong enough to dissolve razorblades.
26. The human brain cell can hold 5 times as much information as the Encyclopedia Brittanica.
27. Approximately 75% of human poop is made of water.
28. Your eyes are always the same size from birth but your nose and ears never stop growing.
29. It takes the food seven seconds to get from your mouth to your stomach.
30. The average human dream lasts 2-3 seconds.
31. Your brain is more active during the night than the day.
32. One human hair can support 3kg.
33. Human thighbones are stronger than concrete.
34. The tooth is the only part of the human body that can't repair itself.
35. An average human loses about 200 head hairs per day.
36. The white part of your fingernail is called the Lunula.
37. There is enough iron in a human being to make one small nail.
38. Fingernails grow nearly 4 times faster than toenails.
39. A shank is the part of the sole between the heel and the ball of the foot.
40. The talus is the second largest bone in the foot.
41. The attachment of human muscles to skin is what causes dimples.
42. The world`s first test-tube twins were born in June 1981.
43. A 13 year old child found a tooth growing out of his foot in 1977.
44. Neurons continue to grow throughout human life.
45. Your thumb is approximately the same size as your nose.
46. A woman's heart beats faster than a man's.
47. In a year, a person`s heart beats 40,000,000 times.
48. Dogs and Humans are the only animals with prostates.
49. It only takes 7lbs of of pressure to rip off your ears.
50. There are nine muscles in your ear.
51. Your nose can remember 50,000 different scents.
52. The navel divides the body of a newborn baby into two equal parts.
53. If the average male never shaved, his beard would be 13 feet long when he died.
54. Experts say the human body has 60,000 miles of blood vessels. Verified Human Anatomy and Physiology", Third Edition, by Elaine N. Marieb.  copyright date is 1995. p. 643 Thxs, monkee191
55. If they were laid end to end, the blood vessels in your body would wrap around the equator 2 1/2  times.
56. The tongue is the only muscle attached at one end.
57. Fetuses can hiccup.
58. There is a device that can permanently replace the function of your heart. Side effect- you have no pulse. Source
59. A group of people watching a movie tend to blink in unison. Every minute, you lose six seconds of visual information. But lucky for you, you subconsciously control the timing of your blinks to ensure that you don’t miss anything important. Thus it stands to reason that people watching the same movie at the same time would blink at the same time to miss the same unimportant stuff. And they do. Source
60. Nerve impulses to and from the brain travel as fast as 170 miles per hour.
61. Your brain uses 40% of the oxygen that enters your bloodstream.
62. Scientists have counted over 500 different liver functions.
63. Men without hair on their chests are more likely to get cirrhosis of the liver than men with hair.
64. The longest recorded bout of hiccups lasted for 65 years.
65. The longest recorded sneezing fit lasted 978 days. Verified
66. Your stomach has 35 million digestive glands.
67. Your stomach has to produce a new layer of mucus every two weeks otherwise it will digest itself.
68. At the moment of conception, you spent about half an hour as a single cell.
69. In the 1980s a man with severe OCD shot himself in the head in an attempt to commit suicide. Instead of killing him, the bullet destroyed the part of his brain that was responsible for his OCD, and he went on to become a straight-A college student five years later. Source
70. There is about one trillion bacteria on each of your feet.
71. Each square inch of human skin consists of twenty feet of blood vessels.
72. A small number of humans may be born with Heterochromia iridum, or dual eye coloration. One eye may be blue, and the other brown or hazel. Causes of eye color discrepancies may stem from genetic mutations, combinations of distinct cells. Although most people with this “condition” are born with it, rare cases of medication induced Heterochromia have been reported. Source
73. There are no two tongue prints that are alike.
74. Your body contains about four ounces of salt.
75. Injured fingernails grow faster than uninjured ones.
76. Women blink twice as much as men.
77. Most people blink about 25 times a minute.
78. It is impossible for the average person to sneeze with their eyes open. Closing your eyes during a sneeze is a reflex action.  Verified
79. The average person's skin weighs twice as much as their brain.
80. When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
81. It takes twice as long to lose new muscle if you stop working out than it did to gain it.
82. The three things pregnant women dream most of during their first trimester are 1) frogs 2) worms 3) potted plants.
83. Your body gives off enough heat in 30 minutes to bring half a gallon of water to a boil.
84. Blondes have more hair than dark-haired people.
85. The largest internal organ is the small intestine. Despite being called the smaller of the two intestines, your small intestine is actually four times as long as the average adult is tall.
86. Facial hair grows faster than any other hair on the body.
87. Bone is stronger, inch for inch, than the steel in skyscrapers.
88. About one third of the human race has 20-20 vision.
89. In a hot climate, you can sweat as much as 3 gallons of water a day.
90. Fingernails are made from the same substance as a bird's beak.
91. A runner consumes about 7 quarts of oxygen while running a 100-yard dash.
92. Among the first known "dentists" of the world were the Etruscans. In 700 BC they carved false teeth from the teeth of various mammals and produced partial bridgework good enough to eat with.
93. The enamel in your teeth is the hardest substance in your body.
94. Your teeth start growing 6 months before you are born.
95. Your big toes have two bones each while the rest have three.
96. A pair of human feet contain 250,000 sweat glands.
97. Ophthalmic surgery was one of the most advanced areas of medicine in the ancient world. Detailed descriptions of delicate cataract surgery with sophisticated needle syringes is contained in the medical writings of Celsus (A.D. 14-37)
98. Living brain cells are bright pink.
99. You're ears secrete more earwax when you are afraid than when you aren't.
100. Your body uses 300 muscles to balance itself when you are standing still.
101. If saliva cannot dissolve something, you cannot taste it.
102. Your body contains the same amount of iron as an iron nail.
103. The average woman is 5 inches shorter than the average man.
104. The ashes of a cremated person average about 9 pounds. A big part of what gives the human body weight is the water trapped in our cells.
105. Every human spent about half an hour as a single cell.
106. About 32 million bacteria call every inch of your skin home.
107. When a pregnant woman suffers organ damage (ex: a heart attack), the fetus will send stem cells to repair the damaged organ.  Source
108. Autophagia refers to the condition of eating yourself, or parts of yourself—often by simply biting and chewing impulsively. One man apparently began by merely biting his own nails—but ended up with such a problem that he severely mutilated his fingers. Source
109. There is a weight limit for donating your body to science. Source