Which statement about arteries and veins is CORRECT?
A. For an artery and vein of the same diameter, the vein would have a thicker wall.
B. Blood pressure is lower in arteries than in veins.
C. Both arteries and veins are under pressure.
D. Veins contain valves and arteries do not.
E. When empty, an artery is more likely to be collapsed (flattened) than a vein.
Answer: D
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