Question

Arteries can constrict or dilate as needed because of the smooth muscle found in the
A. tunica intima.
B. tunica media.
C. tunica adventitia
D. tunica externa.
E. tunica interna..

Answer 1

I would say they are found in [B], the Tunic Media due to the following information.
Website: www.interactivephysiology.com
•In the elastic artery, elastin forms most of the wall of the tunica media. In the muscular artery, the tunica media is composed mainly of smooth muscle. elastin than elastic arteries in the tunica media. This enables them to actively constrict and relax.