Oxygenated blood reaches heart by

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pulmonary artery

pulmonary vein

aorta

vena cava

answer is B.

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Detailed Solution

The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium, blood flows into the left ventricle which then pumps the blood into the aorta. Aorta branches out into various arteries which distribute the oxygenated blood to all parts of the human body.

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