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Fluid-mosaic model. 1  Plasma membrane consists of a phospholipid bilayer studded with proteins, polysaccharides, lipids. 2  The lipid bilayer is semipermeable Regulates passage of substances into and out of the cell. H2O and some small, uncharged, molecules (O2, CO2) can pass through.
Lists of functions of a cell membrane (= plasma membrane) can include various numbers of functions because particles can move across the membrane in several different ways, including diffusion via ion channels, active transport via membrane pumps, endocytosis (into the cell) and exocytosis (out of the cell). The cell membrane forms a barrier between the inside of the cell and the environment outside the cell-enclosing cytoplasm and any organelles within the cell, and enabling different chemical environments to exist on each side of the cell membrane.