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The two main stages of a heartbeat are diastole and systole. During diastole, the heart muscles relax, allowing the chambers to fill with blood; the atria fill with blood from the body and lungs, and the ventricles fill with blood from the atria. In systole, the heart muscles contract, pumping blood out of the ventricles: the right ventricle sends blood to the lungs for oxygenation, while the left ventricle pumps oxygen-rich blood to the rest of the body. These coordinated contractions and relaxations ensure efficient blood circulation throughout the body.

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