There are four heart compartments or chambers. The upper two are the atria, and the lower two are ...
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There are four heart compartments or chambers. The upper two are the atria, and the lower two are ventricles. Blood comes into the chambers and is then pumped to the rest of the body to supply nourishment. The flow of blood inside the heart is controlled by four thin, flexible valves that open and close with each heartbeat.

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