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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 sodium-potassium pump moves potassium to the _______________ of the cell. During a resting potential, the cellâs cytoplasm is _______________ relative to the outside of the cell. At the peak of the action potential, the cellâs cytoplasm is _______________ relative to the outside of the cell.