Simple Diffusion - Ion transport

In the process of diffusion, a substance tends to move from an area of high concentration to an area of low concentration until its concentration becomes equal throughout a space. Ions must diffuse through membrane pores or gated channels. Pores are always open. More pores allow more ions to diffuse. Chemicals or changes in voltage often provide the stimuli to open or close the gated channels. Gated channels can be opened or closed.

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