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Cell membrane A cell membrane, plasma membrane or plasmalemma is a selectively permeable lipid bilayer coated by proteins which comprises the outer layer of a cell. It is a fluid patchwork of molecules in constant motion. This mobility is due to the flexible proteins and oily phospholipids that make up most of the membrane's chemical structure. Carbohydrates attached to the proteins and phospholipids form glycoproteins and glycolipids. It consists of, among other components, phospholipid and protein molecules which separate the cell interior from its surroundings within animal cells, and control the input and output of the cell through the use of receptor and cell adhesion proteins, which also play a role in cell behavior and the organization of cells within tissues. In animal cells the plasma membrane alone establishes a separation between interior and environment, whereas in fungi, bacteria, and plants an additional cell wall forms the outermost boundary. However the cell...

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