ANATOMY

Detailed explanation-1: -The wall of blood vessels is comprised of three layers, the innermost tunica intima, made of endothelial cells and a thin layer of subendothelial connective tissue; the intermediate, tunica media, mainly made of smooth muscle tissue; and the outer, tunica adventitia, made of collagen fibers.

Detailed explanation-2: -The tunica intima consists of a layer of endothelial cells lining the lumen of the vessel, as well as a subendothelial layer made up of mostly loose connective tissue.

Detailed explanation-3: -Tunica Intima Capillaries consist only of the thin endothelial layer of cells with an associated thin layer of connective tissue.

Detailed explanation-4: -The endothelium is a thin layer of single flat (squamous) cells that line the interior surface of blood vessels and lymphatic vessels. Endothelium is of mesodermal origin. Both blood and lymphatic capillaries are composed of a single layer of endothelial cells called a monolayer.

Detailed explanation-5: -The tunica interna is primarily made of epithelial tissue, with a thin layer of connective tissue (known as the subendothelial layer). The tunica media is primarily made of smooth muscle tissue, along with collagen and elastin.