important role is to regulate the movement of materials into and out of cells. The phospholipid bilayer structure (fluid mosaic model) with specific membrane. proteins accounts for the selective permeability of the membrane and passive. and active transport mechanisms.
Structure of Blood Vessels a) Three distinct layers or tunics form the walls of blood vessels: ---The tunica interna (tunica intima) is the innermost layer.It contains the endothelium which is a continuation of the endocardial lining of the heart.tructure of Blood Vessels a) Three distinct layers or tunics form the walls of blood vessels: ---The tunica interna (tunica intima) is the innermost layer.
Hello, The arteries and veins have different structures, veins having two layers and arteries having three. Tunica intima is the innermost/ tunic media the middle one and tunica adventitia is the outermost. The outermost layer {tunica adventitia} is made of connective tissue.It contains nerves that supply the vessel and tiny nutrient capillaries (vasa vasorum) in the larger blood vessels.he arteries and veins have different structures, veins having two layers and arteries having three. Tunica intima is the innermost/ tunic media the middle one and tunica adventitia is the outermost.