Question

Why is pulmonary vein cannot called vein?

Answer 1

The function of the pulmonary veins is to transport that oxygenated blood from the lungs to the heart. They are still called veins because they transport blood to the heart, regardless of whether or not the blood is deoxygenated or oxygenated

Answer 2

because pulmonary vein carry deoxygenated blood and a vein carry oxygenated blood. Therefore, we cannot call pulmonary vein as vein.

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