cell membrane - The cell membrane is often called the plasma membrane., Concentration  - the amount of something in a given volume, diffusion  - the overall movement of molecules from a region of higher concentration to a region of lower concentration by their random movements, tending to reduce the difference in concentration between the two regions, Concentration gradient  - When a solution has such a gradient, random movements of molecules tend to even out their concentration over all the space they reach. Since the movement overall is from regions of high to regions of low concentration, movement is considered to be down the gradient. Diffusion, then, is the net movement of molecules down a concentration gradient., simple diffusion - diffusion through a membrane by molecules to which the membrane bilayer is permeable, not requiring transport proteins, osmosis - the diffusion of water across a semipermeable membrane, solute - a substance that dissolves in solvent, Facilitated diffusion - diffusion across a membrane that is aided by transport proteins, Transport proteins - proteins that help molecules get through a membrane, channel proteins - a membrane transport protein with a channel through it through which particular molecules or types of molecules can pass relatively easily, carrier proteins - a membrane transport protein that allows molecules to cross passively to the other side of the membrane,

Cell Transport

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