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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Asthma cases in Americans are about 75% higher today than they were in 1980.