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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.
What controls the flow of materials in and out of the cell? What part in cell works regulates flow of materials into and out of cells? The cell membrane, which is a partially permeable membrane which 'selects' what goes in and comes out of a cell.