Question

multiple choice question
during vasoconstriction, smooth muscle in an artery contracts. the smooth muscle of an artery is located in the _______.
o tunica externa
o tunica interna
o tunica media

Explanation:

Arteries have three layers. The tunica media is the middle - layer and contains smooth muscle. Vasoconstriction occurs due to the contraction of this smooth muscle in the tunica media.

Answer:

C. tunica media