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The heart is a fist-sized muscular organ that pumps blood around the body. It is actually two pumps that are joined together. At the top of each side of the heart is a thin-walled chamber called the atrium. It receives blood that returns to the heart through the veins.

Once the atrium is filled, it contracts and squeezes its blood into a much more muscular chamber called the ventricle.The ventricle contracts in turn and forces blood at high pressure along the arteries and off to the lungs or read more...

Tags: blood, pumps, arteries

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