Question

what layer of the blood vessel wall is composed of circularly arranged layers of smooth muscle cells? multiple choice tunica externa tunica media tunica intima

Explanation:

The tunica media of the blood - vessel wall is made up of circularly arranged layers of smooth muscle cells. It helps in regulating blood vessel diameter and blood flow. The tunica externa is mainly connective tissue, and the tunica intima is the innermost layer with endothelial cells.

Answer:

B. Tunica media