Larger molecules that cannot pass the membrane from passive diffusion require channels to help them move. This occurs through facilitated diffusion.

University of Wisconsin - Madison

- simple diffusion
- facilitated diffusion
- osmosis

Types of Passive Transport

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Simple diffusion occurs when compounds like carbon dioxide that cross the membrane with the concentration gradient.

Simple Diffusion

Facilitated Diffusion

Osmosis is the passive diffusion of water. Water passes the membrane to where there is a lower concentration of water. This does not require energy. Osmosis can causes stress and pressure on cells depending on the environment. 

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