The pulmonary vein carries blood that is rich in oxygen back to the heart. Is there anything unexpected about the name of this vein?
A. Veins usually carry blood that has been depleted of oxygen.
B. There is nothing unexpected about the name of this vein.
C. Pulmonary refers to veins that carry blood to the lungs.
D. Veins usually carry blood away from the heart.
Answer: A
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