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Question

Oxygenated blood returns from lungs to the heart through

A
Coronary vein
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B
Pulmonary vein
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C
Coronary artery
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D
Pulmonary artery
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Solution

The correct option is B Pulmonary vein
Veins are the blood vessels that carry blood to the heart. Pulmonary veins are responsible for carrying oxygenated blood from the lungs to the left atrium of the heart.
Humans have four of these veins in total, two from each lung.
There are two right pulmonary veins, known as the right superior and right inferior veins. These carry blood from the right lung. The fact that these veins carry oxygenated blood makes them different from all other human veins, as they are used to carry deoxygenated blood.

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Double circulation / Pulmonary circulation / Oxygenation of Blood
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