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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.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.