Cell membrane /Plasma membrane
Plasma membrane or cell membrane Plasma membrane or cell membrane is a dynamic , fluid structure and forms external boundary of the cell. It acts as a selective permeable membrane and regulates molecular traffic across the boundary. Plasma membrane behaves as a capacitor. In absence of integral membrane proteins, plasma membrane have similar electrical properties. The non conductive lipid bilayer of the membrane separates the conductive extracellular and intracellular electrolyte solutions. This results in the separation of charge across the lipid bilayer and this charge separation brings about an electrical potential difference across the bilayer which is referred to as membrane potential. Different models are: Overton model The Overton model, (1899) proposed by Charles Overton, suggests that the plasma membrane is primarily composed of lipids, and its permeability is largely determined by the lipid solubility of substances. This model is based...