Movement in & out of cells

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  • Created by: Jessica
  • Created on: 14-12-12 19:08
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  • Movement in & out of cells
    • Diffusion
      • Passive process
      • The movement of gases from an area of high concentration to a low concentration through a semi permeable membrane
      • Rate of diffusion depends on 3 factors
        • Concentration graduebt:- the greater the difference in concentration on either side of the exchange surface the faster diffusio
        • Surface are: - The larger the exchange surface the faster diffusion is
        • Thickness of exchange surface :- The thinner the exchange surface the faster the rate of diffusion
    • Facilitated diffusion
      • Passive process
      • From an area of high concentration to low concentration through the channel proteins of the plasma membrane
      • A particular carrier protein and a specific protein bind causing it to change shape  and the protein molecule is released to the inside of the molecule
    • Active transport
      • Active process
      • Movement of materials against the concentration gradient from low to high concentration using energy
    • Co-transport
      • Active & passive
      • Sodium is pumped out via active transport, this creates a concentration gradient for the sodium (active)
        • Glucose then binds with the sodium which diffuses into the cell via diffusion (passive)
          • Potassium is pumped into the cell via active transport to restore ionic balance (active)
      • In small intestine:- Involves glucose, sodium and potassium
  • Osmosis
    • Movement in & out of cells
      • Diffusion
        • Passive process
        • The movement of gases from an area of high concentration to a low concentration through a semi permeable membrane
        • Rate of diffusion depends on 3 factors
          • Concentration graduebt:- the greater the difference in concentration on either side of the exchange surface the faster diffusio
          • Surface are: - The larger the exchange surface the faster diffusion is
          • Thickness of exchange surface :- The thinner the exchange surface the faster the rate of diffusion
      • Facilitated diffusion
        • Passive process
        • From an area of high concentration to low concentration through the channel proteins of the plasma membrane
        • A particular carrier protein and a specific protein bind causing it to change shape  and the protein molecule is released to the inside of the molecule
      • Active transport
        • Active process
        • Movement of materials against the concentration gradient from low to high concentration using energy
      • Co-transport
        • Active & passive
        • Sodium is pumped out via active transport, this creates a concentration gradient for the sodium (active)
          • Glucose then binds with the sodium which diffuses into the cell via diffusion (passive)
            • Potassium is pumped into the cell via active transport to restore ionic balance (active)
        • In small intestine:- Involves glucose, sodium and potassium
    • Passive process
    • The passage of water from a region of high water potential to a region of low water potential through a partially permeable membrane
    • Polar and non-polar

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