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11 Surprising Facts About Your Heart

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Matters of the heart

The hardest-working muscle in your body is your heart, according to the Library of Science's Mysteries series.

It pumps out 2 ounces of blood at every heartbeat, adding up to at least 2,500 gallons daily. The heart has the ability to beat over 3 billion times in a person's life.

Next: Too much sitting or driving could be trouble

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