A4.3.1.HeartMatter
At rest, the heart pumps out about 80 millimeters (2.6 oz) of blood with each beat. The heart beats, on average, 70 times each minute at rest. This means all the blood is circulated (goes round the body once) in about one minute. During strenuous exercise the heart can pump six to eight times the amount of blood that it pumps at rest. ................
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