Which of the following is correct about the transverse section of a vein, when compared with that of an artery?
A The lumen of a vein is wider than that of an artery
B The endothelium of the vein is thinner than that of an artery
C There are more smooth muscles in a vein than in an artery
D There are valves in veins but not in arteries.
Answer is D
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