Question

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

Explanation:

The tunica media of blood - vessel walls contains circularly arranged layers of smooth muscle cells. The tunica intima is the innermost layer with endothelial cells, and the tunica externa is the outermost layer with connective tissue.

Answer:

A. Tunica media