Top 100 most interesting facts about the human body

  1. The average adult human body is made up of 50-65% water.
  2. The human brain consists of about 86 billion neurons.
  3. Your body has more than 600 muscles.
  4. The human heart beats over 3 billion times in an average lifespan.
  5. Your heart pumps around 2,000 gallons of blood each day.
  6. The lungs contain 300-500 million tiny sacs called alveoli. If they were flattened out, they would have a total surface area of about 70 square meters.
  7. The liver is the body's largest internal organ and its largest gland.
  8. It takes about 12-48 hours for food to pass through your digestive system.
  9. Humans have 206 bones in their body.
  10. The femur (thigh bone) is the strongest bone in the human body.
  11. Your skin is your largest organ, and it regenerates itself approximately every 27 days.
  12. Each square inch of human skin consists of 19 million cells.
  13. The human body contains enough iron to make a 3-inch long nail.
  14. The smallest bone in your body is in your ear.
  15. A full bladder is roughly the size of a soft ball.
  16. If uncoiled, the DNA in all the cells in your body would stretch 10 billion miles, which is from here to Pluto and back.
  17. The human brain can generate about 23 watts of power when awake.
  18. Your sense of smell is around 10,000 times more sensitive than your sense of taste.
  19. Your mouth produces about one liter of saliva each day.
  20. The average person has 5 liters of blood.
  21. The average adult breathes in the equivalent of 13 pints of air every minute.
  22. Your fingernails grow faster than your toenails.
  23. Your left lung is smaller than your right lung to make room for your heart.
  24. Every day, your heart creates enough energy to drive a truck for 20 miles.
  25. Stomach acid (HCl) is strong enough to dissolve razor blades.
  26. Your brain is sometimes more active when you're sleeping than when you're awake.
  27. Humans are the only species known to shed emotional tears.
  28. Human bones are about 5 times stronger than steel.
  29. There are more bacteria in your mouth than there are people in the world.
  30. The average person walks the equivalent of three times around the world in a lifetime.
  31. Blood vessels in the human body would stretch 60,000 miles if laid end to end.
  32. The human eye can distinguish between approximately 10 million different colors.
  33. Each of your kidneys contains 1 million individual filters.
  34. You have about 100,000 hair follicles on your head.
  35. The human nose can remember 50,000 different scents.
  36. Each foot contains about 250,000 sweat glands.
  37. Your ears and nose continue to grow throughout your entire life.
  38. It takes 17 muscles to smile and 43 to frown.
  39. The average person farts 14 to 23 times a day.
  40. Your body produces enough heat in 30 minutes to boil 1.5 liters of water.
  41. Women's hearts beat faster than men's.
  42. Humans are bioluminescent and glow in the dark, but the light is 1,000 times weaker than our human eyes are able to pick up.
  43. Your taste buds are replaced every 10 to 14 days.
  44. Nerve impulses travel to and from the brain at speeds of up to 250 miles per hour, faster than a Formula 1 racecar.
  45. Humans share 50% of their DNA with bananas.
  46. The surface area of a human lung is equal to that of a tennis court.
  47. The average person will breathe in around 8,409,600 liters of air every day.
  48. Your tongue is made up of 8 different muscles.
  49. When listening to music, your heartbeat can sync with the rhythm.
  50. The cornea of the eye is the only part of the body that has no blood supply. It receives oxygen directly from the air.
  51. The human brain is the fattest organ in the body and may consist of at least 60% fat.
  52. The largest organ in the body is the skin.
  53. Babies have 300 bones, but adults have 206.
  54. Humans shed and regrow their outer skin cells about every 27 days.
  55. If you laid all of your blood vessels end to end, they would stretch around the world more than twice.
  56. Humans shed about 600,000 particles of skin every hour.
  57. Your brain uses 20% of the total oxygen and blood in your body.
  58. You produce about a liter of mucus per day.
  59. Your brain is composed of 75% water.
  60. You blink over 10,000,000 times a year.
  61. Most people lose 50 to 100 hairs a day.
  62. The human embryo acquires fingerprints within three months of conception.
  63. People have the same number of neck vertebrae as giraffes.
  64. When awake, the human brain produces enough electricity to power a small light bulb.
  65. Your body has enough iron in it to make a nail 3 inches long.
  66. Everyone has unique tongue prints, just like fingerprints.
  67. A cough releases an explosive charge of air that moves at speeds up to 60 mph.
  68. A sneeze can exceed the speed of 100 mph.
  69. Humans have a "diving reflex" that shuts down bodily functions when submerged in water to prevent drowning.
  70. Your body has more than 100 trillion cells.
  71. Babies are born with reflexes for swimming and holding their breath.
  72. The length of your forearm from elbow to wrist is the same length as your foot.
  73. If you lined up all the eyelashes shed by a human in their life, they would measure over 98 feet long.
  74. Women blink more than men.
  75. The human body produces enough saliva during your lifetime to fill two swimming pools.
  76. Every person has a unique smell, except for identical twins.
  77. Your heartbeat changes and mimics the music you listen to.
  78. It is impossible to tickle yourself.
  79. Humans have stripes called Blaschko’s lines, invisible under normal conditions.
  80. Your body can't digest grass because it lacks the necessary enzymes.
  81. Humans have nearly 300 bones at birth, but as they grow some of these bones fuse together. As a result, adults have only 206 bones.
  82. Your brain weighs about three pounds. Of that, the dry weight is 60% fat, making your brain the fattiest organ.
  83. You produce about 25,000 quarts of saliva in a lifetime, enough to fill two swimming pools.
  84. Your body has about 5.6 liters (6 quarts) of blood. This blood circulates through the body three times every minute.
  85. A human baby has over 60 more bones than an adult.
  86. A quarter of your bones are in your feet.
  87. Your brain is almost 60% fat.
  88. Your eyes are the same size from birth but your nose and ears never stop growing.
  89. You blink over 10,000 times a day.
  90. One in every 2000 babies is born with a tooth.
  91. On average, a person at rest takes about 16 breaths per minute.
  92. The total weight of bacteria in your body is around 2 kilograms.
  93. About 1/3 of all the proteins in your body are collagen, which is present in skin, ligaments, tendons, and bones.
  94. The human heart creates enough pressure when it pumps blood out to the body to squirt blood 30 feet.
  95. The human eye is so sensitive that if the Earth were flat, you could spot a candle flickering at night from up to 30 miles away.
  96. The total length of all the nerves in the human body is 75 kilometers.
  97. Humans and giraffes have the same number of neck vertebrae (seven).
  98. The strongest muscle in the human body is the masseter (jaw muscle).
  99. Your right lung can take in more air than your left.
  100. Your eyes blink approximately 4,200,000 times each year.