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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.