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.,

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