Movement in Cells

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  • Created by: Laura
  • Created on: 03-05-13 09:22
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  • Movement in Cells
    • Diffusion
      • The movement of particles from an area of high concentration to an area of low concentration.
        • Caused by random movement of particles in gases and liquids
      • Passive
        • Takes place down a concentration gradient
        • Does not use energy
      • Diffusion rates are affected by ...
        • Concentration
        • Temperature
        • Available surface area
    • Osmosis
      • A special type of diffusion
        • Only water moves across a partially permeable membrane from an area of high concentration to an area of low concentration of water
          • Moving down its concentration gradient
      • Takes place across cell membrane
        • Cell membranes are partially permeable
    • Active Transport
      • Move across a selectively permeable membrane
      • Substances are moved against a concentration gradient
        • Uses energy produced by cellular respiration
          • Move across a selectively permeable membrane
  • Diffusion rates are affected by ...
    • Concentration
    • Temperature
    • Available surface area

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