Learn about diffusion and osmosis in this Khan Academy video.

Learn about diffusion and passive transport in cells, including facilitated diffusion and how it works.

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This video introduces passive and active transport mechanisms in cells, explaining how substances move across cell membranes.

Learn about passive transport and selective permeability in cell membranes on Khan Academy.

Learn about diffusion, osmosis, and tonicity in this Khan Academy biology lesson.

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Learn about the membrane potential and how it is generated in neurons.

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