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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The familiar sounds of your heart are made by the heart's valves as they open and close.