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The familiar sounds of your heart are made by the heart's valves as they open and close.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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.