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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

Anthropologist Andrea Wiley (left) investigates the effects of high-altitude living on reproductive Anthropologist Andrea Wiley (left) investigates the effects of high-altitude living on reproductive
Deconvolution fluorescence microscopy yields high-resolution optical sections th Deconvolution fluorescence microscopy yields high-resolution optical sections th
Over the past four decades, the self-reported health of married men and women has remained high, ... Over the past four decades, the self-reported health of married men and women has remained high, ...
Women have even more need than men to plan for retirement; at retirement age they have typically ... Women have even more need than men to plan for retirement; at retirement age they have typically ...
The high-voltage shut-off switch on a Ford Escape hybrid. The switch is located under the carpet at ... The high-voltage shut-off switch on a Ford Escape hybrid. The switch is located under the carpet at ...
Examples of low and high Entropy states Examples of low and high Entropy states
Video: Regulation of GFR: autoregulation via tubuloglomerular feedback, neural & hormonal regulation

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