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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 lysosome is the digestive system in the cell. It breaks down molecules into their base components digestive enzymes. This demonstrates one of the reasons for having all parts of a cell compartmentalized, the cell couldnt use the destructive enzymes if they werent sealed off from the rest of the cell.