The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
Muscle male/female
anatomy of arm muscle
Action of Steroid Hormones
Desmosomes and gap junctions, as shown in heart muscle.
