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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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There are 20 feet of blood vessels in each square inch of human skin.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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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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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.