Simple diffusion, The random movement of particles from a region of their high concentration to a region of their low concentration., Semi-permeable membrane, Thin layers of material that allow certain substances to pass through it but not others., Facilitated diffusion, A passive process where specific carriers or channels are used., Channel protein, Consists of pores lined with polar groups that allow charged ions to pass through., Carrier protein, Allow facilitated diffusion across membrane of larger polar molecules., Co-transport, Brings a molecule and ion into a cell on the same carrier protein at the same time..

Diffusion

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