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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

Difficulties in applying the morphological species concept Difficulties in applying the morphological species concept
Species richness of birds in North America. Species richness of birds in North America.
Bluehead wrasse males with yellow females of the species. If the blueheaded male is removed from a t Bluehead wrasse males with yellow females of the species. If the blueheaded male is removed from a t
Roots of the keystone species hypothesis: does a higher proportion of predators in diverse communiti Roots of the keystone species hypothesis: does a higher proportion of predators in diverse communiti
Cross-section view of the human eye. Cross-section view of the human eye.
Human ear anatomy. Human ear anatomy.
Video: Covalent bonds - role in the body

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