Question

Which of the following as no muscular walls?

• A. artery
• B. arteriole
• C. capillary
• D. vein

Answer 1

The correct option is C

capillary

The correct answer is option C

Explanation for correct option:

1. Capillaries have only a thin lining of endothelium with no muscular walls.
2. The main function of capillaries is the exchange of gases and nutrients from the blood to the cells and back to the blood.
3. Hence, it has very thin walls for proper facilitation of exchange.

Explanation for incorrect option:

Option A

Arteries have relatively thick muscular walls due to high blood pressure because blood flows with high pressure in arteries.

Option B

Arterioles have thick muscular walls due to high blood pressure.

Option D

Veins have thicker walls than capillaries and use valves to transport blood toward the heart.

Final answer: Capillary has no muscular walls.