C. Are thinner Compared to the walls of arteries, the walls of veins are thinner. This is because blood being pumped into the arteries is at much higher pressure compared to the blood being carried in veins. Hence, veins have thinner walls compared to arteries.
Compared with the walls of arteries, the walls of veins a. are thicker. c. lack valves. b. are thinner. d. have more resistance.