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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.
It selectively regulates the passage of substances into and out of  the cell. It is a very important part of a cell.   the cell membrane holds all of the stuff inside of â¦ the cell. Also  it shapes the cell that is how a animals cell is circled and a  plants cell has squared cells.