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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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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Thyroid conditions may make getting pregnant impossible.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

A hypothetical hybrid zone. A hypothetical hybrid zone.
Procedural memory includes skills that are handed down in a culture from generation to generation. Procedural memory includes skills that are handed down in a culture from generation to generation.
Enzymes: Note the enzyme has the ending ase as in sucrase and the actual substrate is sucrose. Enzymes: Note the enzyme has the ending ase as in sucrase and the actual substrate is sucrose.
(B) Actual photo of fetus at week 9. (B) Actual photo of fetus at week 9.
Typical Mendelian pattern of inheritance of HLA haplotypes includes children AC, BC, AD, and BD. ... Typical Mendelian pattern of inheritance of HLA haplotypes includes children AC, BC, AD, and BD. ...
Exercising in the "fat-burning" zone or the "cardio" Exercising in the "fat-burning" zone or the "cardio"
Video: Major Elements in Biological Molecules: Carbohydrates

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