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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.
3. Regulate the movement of substances into and out of the cell. For instance, aquaporins on the cell surface membrane allow water to enter the cell by osmosis. Glucose carrier proteins specifically transport glucose into and out of cells. Ion channels control the movement of ions into an out of the cell.