Oxygenated blood proceed into the pulmonary vein, 5, Deoxygenated blood enters the heart through the superior and inferior venae cavae, 1, Blood flows into the branches of capillaries in the alveoli to recieve oxygen, 4, The left atrium receives oxygenated blood and pushes the mitral valve open, 6, The tricuspid valve opens to let deoxygenated blood flow from the right atrium to the right ventricle, 2, Oxygenated blood flows into the aorta, 8, Blood flows into the pulmonary artery, then into the lungs for oxygenation, 3, branches of arteries deliver the oxygenated blood to different parts of the body, 9, oxygen from the blood is absorbed by the cells, 10, The left ventricle contracts and opens the aortic valve., 7

Heart Sequence

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