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The Heart
Introduction
You need your heart for all your body needs. It pumps about 2000
gallons of blood a day. It takes about 20 seconds for blood to reach every
cell in the body. An artery carries blood out from the heart. A vein carries
blood back to the heart. An average adult heart weighs about 10-13 ounces (300
to 350 grams). The rate which the heart pumps varies depending on what your
doing. When at rest the heart pumps more slowly. When you run the heart rate
increases to provide muscles and other tissues with additional oxygen they need.
The typical heart rate is 72 beats per minute. Each beat gives out 2-3 ounces
of b ....
Word count: 1535 - Page count: 6
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