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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 thin, flexible barrier around the Cell; and it regulates what enters and leaves the Cell. The next closely related organelle is the Golgi Complex or Aâ¦pparatus. The Golgi Complex is an organelle that modifies, packages, and transports material out of the Cell by using vesicles ( small membrane sacs or packages ). Nevertheless, the Nucleus, I believe, is what actually controls the Golgi Complex (and thus regulates what goes out).