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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.