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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.