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The familiar sounds of your heart are made by the heart's valves as they open and close.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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.
For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.