How many pulmonary arteries empty into the right atrium of the heart?
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There are 4 total pulmonary veins with 2 pulmonary veins coming from each lung, left and right -that empty into the left atrium of the heart. Two pulmonary veins emerge from the hilus of each lung, and each pulmonary veins receive blood from 3-4 broncial veins a piece before draining into the left atrium
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