Question

question 22
1.67 pts
the_________ is composed of circularly arranged layers of smooth muscle cells.
○ tunica media
○ none of the answers is correct.
○ tunica externa
○ tunica interna
○ tunica intima

Explanation:

The tunica media of blood vessels is made up of circularly - arranged layers of smooth muscle cells. It helps regulate blood vessel diameter and blood flow.

Answer:

A. tunica media