There are more bacteria in your mouth than there are people in the world.
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The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").
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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are approximately 3 million unintended pregnancies in the United States each year.
Wood first appeared in plants called progymnosperms.
The Coronary Arteries and Major Veins of the Heart (Anterior and Inferior Views)
Anterior and lateral views of the body illustrating directional terms.
Three views of neurulation in an amphibian embryo
(a) Homologous traits are similar due to shared ancestry. (b) Analogous traits (bats’, birds’, and f