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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.
Plasma proteins invovled in the control of blood clotting. The liver releases the protein antihrombin III (inactive form) into the plasma: - antithrombin III is a protease that inactivates the clotting factor thrombin and other factors.