Study notes
Movement of Substances
How particles and water move into, out of, and across cells: diffusion, osmosis, and active transport, kept clearly distinct from one another.
What this topic covers
- Diffusion: any particle, moving down its own gradient, no energy
- Diffusion moves useful substances in and waste out
- Osmosis is specifically about WATER, across a partially permeable membrane
- Osmosis in plant cells: turgid, flaccid, or plasmolysed
- Osmosis in animal cells: lysis or crenation, no wall to resist
- Active transport moves particles AGAINST the gradient, and needs energy
- Root hair cells use active transport to take up mineral ions
- Villus cells use active transport to finish absorbing glucose
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