Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 5 - No. 36)
What is the difference between facilitated diffusion and diffusion?
Facilitated diffusion requires energy, while diffusion does not.
Facilitated diffusion uses channel or carrier proteins, while diffusion does not.
Facilitated diffusion moves molecules against the concentration gradient, while diffusion moves them down.
Facilitated diffusion moves water only, while diffusion moves other molecules.
Explanation
Facilitated diffusion uses specific proteins (channel or carrier) to help molecules cross the membrane, but it does not require energy. Diffusion is the direct movement of molecules across the membrane without the need of any protein.
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