Which layer of a blood vessel contains smooth muscle that changes the vessel diameter?
Correct answer: B. Tunica media
- A. Tunica intima
- B. Tunica media
- C. Tunica externa
- D. Endocardium
Explanation
The tunica media contains smooth muscle and elastic fibres, allowing arteries and arterioles to constrict or dilate. The tunica intima lines the lumen, while the tunica externa provides outer support. Endocardium lines the inside of the heart.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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