Osmosis (CIE IGCSE Biology: Co-ordinated Sciences (Double Award))
Revision Note
Osmosis
- All cells are surrounded by a cell membrane which is partially permeable
- Water can move in and out of cells by osmosis
- Osmosis is the diffusion of water molecules from a dilute solution (high concentration of water) to a more concentrated solution (low concentration of water) across a partially permeable membrane
- In doing this, water is moving down its concentration gradient
- The cell membrane is partially permeable which means it allows small molecules (like water) through but not larger molecules (like solute molecules)
Osmosis and the partially permeable membrane
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