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.
Tunica intima. This is the innermost layer and lines the lumen of the blood vessels. It consists of simple squamous epithelium and a thin layer of areolar CT (basement membrane) to stick it to the Tunica media.. The basement membrane is often seen as a squiggly line right under the simple squamous epithelium.