The average adult body contains between 5 and 5½ liters of blood and approximately 10 liters of interstitial fluid. This forms approximately 60% of the human body. This ratio varies from 75% in a newborn infant to 45% in an obese person.
With the 60,000 miles of blood vessels inside the average human body, you could circumnavigate Earth two and a half times
For every pound of fat or muscle gained, your body creates seven miles of new blood vessels.
Your body produces 25 million new cells each second. Every 13 seconds, you produce more cells than there are people in the United States.
Your stomach manufactures a new lining every three days to avoid digesting itself. As a part of the digestive process, your stomach secretes hydrochloric acid, which is very corrosive.
