Transport in and out of cells
- Created by: Nadia
- Created on: 28-12-12 14:42
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- Transport in and out of cells
- Diffusion is the movement of substances down a concentration gradient
- diffusion doesn't require energy
- the cell membrane is selectively permeable + only lets certain substances through
- the molecules that go through the cell membrane are small molecules, large molecules can't get through
- Osmosis is a form of diffusion specifically involving water and through a cell membrane
- in osmosis there is a net movement of water from a dilute solution to a more concentrated solution
- osmosis and diffusion are two-way processes, molecules always move in both directions but more move in one direction
- Active transport is when substances travel against a concentration gradient
- this process requires energy
- Diffusion is the movement of substances down a concentration gradient
- the molecules that go through the cell membrane are small molecules, large molecules can't get through
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