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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 average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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