Blood vessels show which sign of aging?
A) elastin fibers in their walls are replaced by collagen or calcium deposits
B) they become softer and expand more easily
C) the smooth muscle layer constricts more readily
D) elastin fibers double in quantity
E) veins develop more valves

Question

Quizplus · Accepted Answer

As blood vessels age, elastin fibers in their walls are often replaced by collagen or calcium deposits, leading to decreased elasticity and increased stiffness.

Blood Vessels Show Which Sign of Aging