Which of the following is correct about the transverse section of a vein, when compared with that of an
artery?
The lumen of a vein is wider than that of an artery
The endothelium of the vein is thinner than that of an artery
There are more smooth muscles in a vein than in an artery
There are valves in veins but not in arteries.
Correct answer is D
No explanation has been provided for this answer.