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.
What is the innermost layer of the heart wall called? The endocardium is the innermost layer of the heart wall. What is the innermost meningeal layer of the brain called? The pia mater is the delicate innermost layer of the meninges-the  membranes surrounding the brain and spinal cord. It is delicate and  vascular, and follows every contour oâ¦f the brain.