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Question

To reach the left side of heart the blood must pass through

A
Sinus venosus
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B
Kidneys
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C
Liver
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D
Lungs
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Solution

The correct option is B Lungs
Deoxygenated blood reaches from systemic circulation to right side of the heart. From there it is carried to the lungs for oxygenation. The oxygenated blood is carried from lungs to the left side of the heart. From lungs, pulmonary vein carries oxygenated blood to the left atrium. From there oxygenated blood is circulated to the systemic circulation again.
So, the correct answer is option D.

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