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.
Subcutaneous tissue, which is also known as the hypodermis, is the innermost layer of skin. It's made up of fat and connective tissues that house larger blood vessels and nerves. Subcutaneous tissue acts as an insulator and regulates body temperature. The thickness of this layer varies throughout the body and from person to person. Subcutaneous Tissue Composition. The skin is composed of three layers: the epidermis, the dermis, and subcutaneous tissue. There are several structures and specialized cells that exist within subcutaneous tissue, including: Collagen and elastin fibers. Fat cells. Blood vessels. Sebaceous glands. Nerve endings. Hair follicle roots.