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Which vessel would have a larger lumen an artery or its corresponding vein?


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September 09, 2011 7:23PM

Veins have a much larger lumen compared to arteries, this is for several reasons:

Blood in the arteries has left the heart (with exception to the pulmonary artery) much sooner than the blood in veins, therefore it is under much more pressure, so needs more muscle tissue around its walls to a) cope with that pressure and b) to aid the heart in pumping blood.

Blood in veins has much lower pressure, meaning it needs less muscle tissue around the walls, leaving much more room for a hollow lumen (which is lined with valves to prevent backflow of blood).