Which of the following is present in the walls of arteries but not in the walls of veins?
A) Endothelium
B) Smooth muscle
C) Connective tissue
D) Many elastin fibers
E) Valves

Question

Quizplus · Accepted Answer

Arteries have more elastin fibers in their walls compared to veins, which allows them to stretch and recoil as blood is pumped through them. This characteristic helps arteries withstand the higher pressure of blood coming directly from the heart. Veins, on the other hand, have less elastin because they operate under lower pressure and have valves to help blood return to the heart.

Which of the Following Is Present in the Walls of Arteries