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Facts about the human body

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JulioVelasques

The document provides facts about various parts of the human body including blood, the brain, eyes, hair, and skin. Some key facts are that blood circulates through the entire body in about 20 seconds, the brain cannot feel pain itself, women blink twice as much as men, and after death the body dries out making hair and nails appear longer. The document aims to dispel common misconceptions as well, such as cracking knuckles does not cause arthritis.

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Facts About the Human Body
Blood It takes about 20 seconds for blood to travel through your body. Blood is never blue, it just varies from a dark red, to a light red. The blue-green coloring we see is due to the color of our veins and how light passes through.
The Brain The brain itself can't feel pain. We don't use 10% of our brain, we use most of it, and the parts we don't really use, are basically useless. Having more of something doesn't always make it better.
Eyes Our eyes stay the same size our whole life, while our ears and nose keep growing until death. Women blink twice as much as men. Humans are the only animals that produce tears emotionally. You can't cry in space, tears won't fall without gravity
The Body Eating before swimming doesn't actually cause cramps. Hair doesn't grow back thicker, it's just blunt after being shaved. Split ends can't be fixed, hair is dead, so you have to cut it. Shampoo and conditioner only make hair smooth.
Misconceptions Cracking your knuckles doesn't cause arthritis. The cracking you hear is either nitrogen moving, or your tendons snapping over your bones (which happens over time anyway) The redhead gene isn't going extinct, it's recessive, so many people have it, they just don't know it.
After Death After death, your body dries out and your skin recedes, causing it to look like your hair and nails have grown
Extras It only takes about 7 pounds of pressure to rip your ear off. Alcohol doesn't kill brain cells, it just weakens connective tissue and makes it feel that way. The brain can repair itself, so damaged tissue repairs relatively fast

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Facts about the human body

  • 1. Facts About the Human Body
  • 2. Blood It takes about 20 seconds for blood to travel through your body. Blood is never blue, it just varies from a dark red, to a light red. The blue-green coloring we see is due to the color of our veins and how light passes through.
  • 3. The Brain The brain itself can't feel pain. We don't use 10% of our brain, we use most of it, and the parts we don't really use, are basically useless. Having more of something doesn't always make it better.
  • 4. Eyes Our eyes stay the same size our whole life, while our ears and nose keep growing until death. Women blink twice as much as men. Humans are the only animals that produce tears emotionally. You can't cry in space, tears won't fall without gravity
  • 5. The Body Eating before swimming doesn't actually cause cramps. Hair doesn't grow back thicker, it's just blunt after being shaved. Split ends can't be fixed, hair is dead, so you have to cut it. Shampoo and conditioner only make hair smooth.
  • 6. Misconceptions Cracking your knuckles doesn't cause arthritis. The cracking you hear is either nitrogen moving, or your tendons snapping over your bones (which happens over time anyway) The redhead gene isn't going extinct, it's recessive, so many people have it, they just don't know it.
  • 7. After Death After death, your body dries out and your skin recedes, causing it to look like your hair and nails have grown
  • 8. Extras It only takes about 7 pounds of pressure to rip your ear off. Alcohol doesn't kill brain cells, it just weakens connective tissue and makes it feel that way. The brain can repair itself, so damaged tissue repairs relatively fast