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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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The human body produces and destroys 15 million blood cells every second.

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The top 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.

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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Atherosclerosis. (a) A sectioned coronary artery that exhibits an accumulation of fatty plaque, whic Atherosclerosis. (a) A sectioned coronary artery that exhibits an accumulation of fatty plaque, whic
Incentive spirometry. A portable incentive spirometer is useful for encouraging patients to exercise Incentive spirometry. A portable incentive spirometer is useful for encouraging patients to exercise
Chuck Close, Stanley II, detail. 1980–81. Chuck Close, Stanley II, detail. 1980–81.
Attachment is a close emotional relationship. Attachment is a close emotional relationship.
Packaging materials like zip-close bags, egg cartons, and takeout containers should be thrown away Packaging materials like zip-close bags, egg cartons, and takeout containers should be thrown away
How ABA Causes Stomata to Close How ABA Causes Stomata to Close
Video: Anaphylaxis Animation

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