Why does the lumen of a large vein have a larger diameter than the lumen of a large artery? A. They need to withstand higher pressure than arteries. B. Veins contain the majority of the blood volume. C. This allows blood to return to the heart rapidly. D. So that vasoconstriction can produce a greater change in diameter than for arteries.
Option B. Veins include approximately 60 % of the blood volume (and due to the fact they have thinner walls, they're additionally extra distensible than arteries).
