AP Biology / Unit 2: Cell Structure and Function
2.6 Facilitated Diffusion
Notes
Facilitated diffusion is passive movement through channel or carrier proteins, down the gradient.
- Aquaporins let water through quickly.
- Ion channels can be gated (open/close).
Practice
Facilitated diffusion uses:
Passive, with help.
Aquaporins are channels for:
Speed up osmosis.
A carrier protein becomes saturated when:
Limited number of carriers.
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