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What is the direction of flow of oxygenated blood during a heartbeat?A. left atrium → semilunar/aortic valve → left ventricle → pulmonary veinB.C. left atrium → left ventricle → semilunar/aortic valve → pulmonary veinD. pulmonary vein → left atrium → semilunar/aortic valve → left ventricle
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