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The familiar sounds of your heart are made by the heart's valves as they open and close.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Blood is approximately twice as thick as water because of the cells and other components found in it.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
By definition, when a medication is administered intravenously, its bioavailability is 100%.
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