Deoxygenated blood returns to the heart via the vena cava, enters the right atrium, Blood is pushed through the tricuspid valve, Blood enters the right ventricle, Blood is pushed through the semi-lunar valve, Blood leaves the heart via the pulmonary artery, Heading to wards the lungs, Oxygenated blood returns to the left side of the heart in the, Pulmonary vein, enters the left atrium, Blood moves through the bicuspid valve, Blood enters the left ventricle, Blood is pushed through a semi lunar valve, Blood leaves the heart via the aorta, heading towards the body.

Cardiac cycle

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