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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.

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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.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

The leaf is usually the primary site of photosynthesis in plants. The leaf is usually the primary site of photosynthesis in plants.
Complementary shapes of a substrate and its binding site on an enzyme Complementary shapes of a substrate and its binding site on an enzyme
) Subcutaneous drug administration: (b) the administration site is prepped ) Subcutaneous drug administration: (b) the administration site is prepped
The site of nitrogen fixation in symbiotic root nodules The site of nitrogen fixation in symbiotic root nodules
Site-specific recombination event catalyzed by RAG1 and RAG2 Site-specific recombination event catalyzed by RAG1 and RAG2
Day 16 Neural groove appears as the neural tube begins forming. Day 16 Neural groove appears as the neural tube begins forming.
Video: Glucose anabolism reactions: Glycogenolysis and Gluconeogenesis

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