Albany State University BIO 2040 Quiz 2 1)The outer layer of a blood vessel, composed of connective tissue a d scattered elastic fibers is called the? The lining of a capillary is called the? The middle layer of a blood vessel? Arteries can constrict or dilae as needed because of the smooth muscle found in the? Which coat of an artery contains endothelium? Sympathetic nerve fibers that innervate blood vessel walls, allowing for vasoconstriction and vasodialation are primarily found in the? The vasa vasorum are?   This layer lines the lumen and is composed of endothelium and connective tissue