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Blood is approximately twice as thick as water because of the cells and other components found in it.

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Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.

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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Papilio machaon caterpillar showing the osmeterium, which emits unpleasant smells to ward off predat Papilio machaon caterpillar showing the osmeterium, which emits unpleasant smells to ward off predat
negative feedback mechanism negative feedback mechanism
Negative feedback control of a regulated variable. Negative feedback control of a regulated variable.
Negative feedback loops affecting hypothalamic and anterior pituitary tropic hormones. Negative feedback loops affecting hypothalamic and anterior pituitary tropic hormones.
Negative feedback mechanism. Negative feedback mechanism.
Negative and positive feedback loops Negative and positive feedback loops
Video: Conduction of action potentials

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