The first time I saw the firefly I knew no it was the feeling that the right atrium received the venous blood of the whole body and pumped out of the pulmonary artery through a right ventricle. At this time the venous blood flowing in the pulmonary artery through the gas exchange in the lung becomes the arterial blood rich in oxygen sent to the left atrium by the pulmonary vein and then pumped to various tissues and organs of the whole body through the aorta of the left ventricle!
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