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.
The innermost layer is called the pia mater. But right in between the arachnoid layer and the pia mater, there is âa spaceâ named the â subarachnoid space. â This subarachnoid space houses the brainâs cisterns (âpoolsâ of Cerebro Spinal Fluid) as well as cerebral arteries and veins.