The heart beats about 100,000 times a day.
Why it is true
This results in pumping approximately 7,500 liters of blood daily throughout the body.
Source: American Heart Association
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.