On average, the stomach produces 2 L of hydrochloric acid per day.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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People about to have surgery must tell their health care providers about all supplements they take.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
Vegetative Organs and Systems
Common hydrogen bonds in biological systems
body systems
Effects of the sympathetic and parasympathetic nervous systems
A taxonomy of primate social systems. Larger symbols indicate adults.