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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.
Hormones that can pass through target cell membranes are called hormones and hormones . ______20. The controls many body functions by issuing instructions to the pituitary gland. c. D. Copyright Â© by Holt.Name Class Date Endocrine System.