DIFFUSION

    Cards (6)

    • Simple diffusion definition
      The net movement of molecules or ions from an area of high concentration to an area of low concentration down a concentration gradient until evenly distributed
    • Is simple diffusion an active or passive process?
      Passive
    • What is facilitated diffusion?

      movement of molecules or ions through channel or carrier proteins
    • Is facilitated diffusion an active or passive process?
      Passive
    • How does a channel protein perform facilitated diffusion?
      Ions bind to protein causing it to change shape in a way that closes it on one side and open to the other side
    • How does a carrier protein perform facilitated diffusion?
      When a molecule (e.g. glucose) that is specific to the protein is present it binds with the protein causing it to change shape in such a way that the molecule is released to the other side of the membrane (down the concentration gradient)
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