Which of the following is due to an aging cardiovascular system?
A)The tunica interna thickens.
B)The direction of blood flow in some capillaries reverses.
C)Arteries become less rigid.
D)Veins lose collagen.

Question

Quizplus · Accepted Answer

The tunica interna, the innermost layer of blood vessels, becomes thicker with age due to the accumulation of lipids and collagen. This can lead to decreased blood flow and increased risk of cardiovascular disease.

Answer: B
 With aging, there is a loss of smooth muscle cells in some capillaries, leading to reduced control of blood flow and the direction of blood flow may sometimes reverse.

Answer: D
 Veins lose collagen and elasticity over time, which can lead to decreased venous return and increased risk of venous insufficiency.

Therefore, the correct choice(s) is/are A and D.

Which of the Following Is Due to an Aging Cardiovascular