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ERISHBRIJUEGAIN
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The pulmonary vein empties oxygen-rich blood from the lungs into the left atrium of the heart. As the atrium contracts,blood flows from your left atrium into your left ventricle through the open mitral valve​

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GANDERZIN

Answer:

Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.

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