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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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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.