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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.
The cell membrane is a severely permeable membrane, and therefore it regulates. the passage of substances into and out of the cell. Osmosis: The diffusion of water (or some other solvent) across a selective permeable. membrane; water diffuses to a hypertonic area. When water enters or leaves the cell it.