Which of the following structural features is associated with arteries but not with veins? A) presence of valves
B) thinner tunica media than veins
C) presence of more elastic fibers and elastic laminae
D) larger lumen than veins

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It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on