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Physiology at a Glance

Some interesting physiological facts:

  1. The human body contains enough: iron to make a 3 inch nail, carbon to make 900 pencils, potassium to fire a toy cannon, fat to make 7 bars of soap, phosphorous to make 2,000 match heads, and water to fill a ten-gallon tank.
  2. You're born with 300 bones, but by adulthood you are left with 206.
  3. One quarter of the bones in your body are in your feet
  4. The first transfusion of blood was performed in 1667, when Jean-Baptiste Denys transfused two pints of blood from a sheep to a boy, he lived.
  5. Most dust particles in your house are made from dead skin.
  6. Women blink nearly twice as much as men.
  7. It is often said you only use 1/10 of your brain (not really true), but it is true that 78% of your brain is water.
  8. A man named Charles Osborne had the hiccups for 69 years.
  9. A cure for the hiccups is to tickle the end of the vagus nerve. Lookup it's termination point in Gray's and you will understand why most people don’t do this and use typical vagal maneuvers.
  10. Laughing lowers levels of stress hormones and strengthens the immune system. Six-year-olds laugh an average of 300 times a day. Adults only laugh 15 to 100 times a day.
    Conclusion: you should laugh more often!
anatomy

Sources:

Gray's
Brain Facts and Figures
Wiki books - Human Physiology/The Nervous System
Trivia about the human body

A Short History of Medicine:

Patient: "Doctor, I have an ear ache."

Doctor's response over the ages:

2000 B.C. - "Here, eat this root."
1000 A.D. - "That root is heathen, say this prayer."
1750 A.D. - "That prayer is superstition, drink this potion."
1920 A.D. - "That potion is snake oil, swallow this pill."
1960 A.D. - "That pill is ineffective, take this antibiotic."
2010 A.D. - "That antibiotic is artificial. Here, eat this root!"