Arteries Can Constrict or Dilate as Needed Because of the Smooth

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

Accepted Answer

The tunica media is the middle layer of the walls of arteries and veins, and it contains smooth muscle and elastic fibers. This layer is responsible for the ability of arteries to constrict or dilate, thereby regulating blood pressure and flow.