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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
The human body produces and destroys 15 million blood cells every second.
Did you know?
If you could remove all of your skin, it would weigh up to 5 pounds.
Did you know?
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
Did you know?
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.