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.
EpidermisâThe Skinâs Outermost Layer. The bodyâs âmiracle wrapâ. The outer layer of our skin, the epidermis, is subdivided into two layers: a thin surface layer of dead cells, called the stratum corneum, and a deeper layer of living cells. The stratum corneum is made up of tightly connected dead cells called corneocytes that form a barrier between the living cells of our body and the outside world.