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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.