The heart is a hollow muscle about the size of your fist. It is located under your rib cage betwee...
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The heart is a hollow muscle about the size of your fist. It is located under your rib cage between your lungs, to the left of your breast bone or sternum. The heart functions as a two-sided pump, with a right side and a left side. Each side has two chambers, an upper collecting chamber called the atrium and a lower pumping chamber called the ventricle. The ventricles are the main force for the circulation of blood throughout your body. The right atrium receives blood from the body that is low in oxygen and high in carbon dioxide waste. Blood then passes from the right atrium down into the right ventricle, which pumps it into the lungs where it releases carbon dioxide and picks up a fresh oxygen supply. The left atrium receives blood from the lungs with its fresh oxygen supply. Blood with oxygen then passes from the left atrium down into the left ventricle, which pumps it to all the organs of the body. The normal heart beats about 60 to 100 times a minute. With each beat, blood moves in, through, and out of the heart to the rest of your body.

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