Illustrate the structure of heart. Explain the steps of cardiac cycle.

The heart is a muscular organ located in the thoracic cavity, between the lungs. It is roughly the size of a fist and consists of four chambers: two atria (upper chambers) and two ventricles (lower chambers). The right atrium receives deoxygenated blood from the body and pumps it into the ___ _______ ________ __________ ________ ________ _______ ___ _________ _________.
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