A de-oxygenated blood cell enters from the superior vena cava and travels down into the right atrium. it then moves through the tricuspid valve, into the right ventricle, and up to the pulmonary artery where it is release into the lungs. IN the lungs the cell becomes oxygenated and enters back into the heart from the pulmonary veins and into the left atrium. She then goes through the bicuspid valve, into the left ventricle, and up through the arch of aorta, moving blood towards the rest of the body.
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