Why does the lumen of a large vein have a larger diameter than the lumen of a large artery?

waelhammad

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2022-10-18

They need to withstand higher pressure than arteries.
Veins contain the majority of the blood volume.
This allows blood to return to the heart rapidly.
So that vasoconstriction can produce a greater change in diameter than for arteries.

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waelhammad

2022-10-18

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B: Veins contain about 60 % of the blood volume (and because they have thinner walls, they are also more distensible than arteries).

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