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| Description: Plasma membranes are selectively permeable The lipid bilayer is always permeable to small, nonpolar, uncharged molecules Transmembrane proteins that act as channels or transporters increase the permeability of the membrane Macromolecules are only able to pass through the plasma membrane by vesicular transport Gradients Across the Plasma Membrane A concentration gradient is the difference in the concentration of a chemical between one side of the plasma membrane and the other An electrical gradient is the difference in concentration of ions between one side of the plasma membrane and the other Together, these gradients make up an electrochemical gradient Transport Across the Plasma Membrane Transport processes that move substances across the cell membrane are: 1. Passive processes Simple diffusion Facilitated diffusion Osmosis 2. Active processes Active transport Vesicular transport Picture Stats: Views: 302 Filesize: 69.73kB Height: 237 Width: 600 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40304 |