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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Your heart beats over 36 million times a year.
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There are 20 feet of blood vessels in each square inch of human skin.
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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.
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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.