How do human heart able to avoid mixing of blood when oxygen rich and carbon dioxide rich reaches the heart ?
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Blood provides oxygen and nutrients to the body and removes carbon dioxide and wastes. ... 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.
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Due to present of valves which doesn't allow mixing of oxygen rich blood with carbon dioxide in the heart
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