Atrium Blood Flow

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Blood flow of the Heart Oxygen-poor blood enters the right atrium from the superior and inferior venae cavae and flows through the atrioventricular tricuspid valve into the right ventricle. Contraction of the right ventricle forces blood through the pulmonary valve into the pulmonary trunk where it is then distributed through right and left pulmonary arteries to the lungs into capillaries, where carbon dioxide is released and oxygen is picked up. Oxygen-rich blood returns from the lungs via pulmonary arteries to the left atrium, flows through the left atrioventricular valve into the left ventricle. Contraction of the left ventricle forces the aortic valve open, and the blood flows through the aortic valve into the ascending aorta and is distributed

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