The lumen size is bigger in vein when compared to artey . why ?
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Arterial walls are actually thicker to cope with the high pressure. It is easier for a thin-walled vessel to rupture than a thick-walled vessel.
In veins, because there is no pressure, blood has to be able to flow back fairly rapidly to be used again. Because of this, veins have larger lumens to allow blood to pass more quickly when not under pressure.
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