diffusion - process of moving from areas of high amounts to areas of low amounts, selective permeability - control over what molecules or ions can enter or leave the cell., concentration - the number of molecules of a substance in a given volume., concentration gradient - an unequal concentration from one region to another., facilitated diffusion - diffusion of molecules through transport proteins in the cell membrane; passive/ no energy, transport protein - spans the membrane, and allows certain molecules or ions to diffuse across the membrane, channel protein - type of transport protein, acts like a pore in the membrane that lets water molecules or small ions through quickly, gated channel protein - a transport protein that opens a "gate," allowing a molecule to pass through the membrane., carrier proteins - a transport protein that is specific for an ion, molecule, or group of substances.,

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