Diffusion and osmosis

    Cards (7)

    • Diffusion
      The movement of particles from an area of high concentration to an area if low concentration
    • It doesn't happen in solids but

      Does happen in liquids and gases
    • The bigger the concentration gradient or higher the temp
      Faster the diffusion rate
    • Dissolved substances can

      Move in and out of a cell by diffusion
    • Since the cell membrane is only partially permeable
      Only small molecules can pass through
    • Alveoli and villi have fast diffusion

      Large surface area, thin walls and good blood supply
    • Osmosis
      Passive movement of water particles across a partially permeable membrane from high to low concentration of water
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