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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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People about to have surgery must tell their health care providers about all supplements they take.
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Cyanide works by making the human body unable to use oxygen.
McBurney’s point is the common location of pain in children and adolescents with appendicitis.
Models of some representative proteins drawn to a common scale
Common STIs in the United States
Three conformations of DNA. B-DNA is most common, A-DNA is likely an artifact of crystallization in