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Oxygenated blood will then pass through the arteries, through the capillaries, and then to the cells. The blood will then become deoxygenated and the next heartbeat starts a new cycle of systemic circulation.

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As the ventricle contracts, blood leaves the heart through the aortic valve, into the aorta and to the body.

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Blood enters left ventricle through mitral valve.

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Oxygenated blood returns to heart via the pulmonary veins going to the left atrium.

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Blood from the right ventricle exits through the pulmonary valve, and enters the pulmonary artery, attached to each lobe of the lungs.

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In the lungs, gas exchange occurs. The blood discards carbon dioxide and picks up oxygen.

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Blood from the Sup. Vena Cava and the Inf. Vena Cava end up in the right atrium, and then exit through the tricuspid valve, entering the right ventricle.

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The Superior Vena Cava receives blood from the head, neck, upper limbs, and chest.

The Inferior Vena Cava receives blood from the trunk, viscera, and lower limbs.