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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.