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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.
cells take in food, oxygen, and other substances from the environment and release waste into the the environment. selectively (semi) permeable. regulates what enters and exits the cell, it is based on the size of the particles and the size of the openings in the membrane. passive transport. the result if a substance moves through the membrane without the input of energy.