Transport in and out of cells

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  • 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
  • the molecules that go through the cell membrane are small molecules, large molecules can't get through

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