Crossing Membranes

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  • Crossing Membranes
    • Diffusion
      • Is the net movement of particles from an area of high concentration, to an area of low concentration
      • Uses Kinetic Energy
      • Factors that affect Diffusion
        • Temperaure - An increase in Temperature increases the Kinetic Energy making Diffusin quicker
        • Concentration Gradient - A Higher Gradient increases diffusion Rate
        • Size of the Molecules - Smaller molecules diffuse quicker
        • Thickness of the surface Membrane - a thick membrane slows down diffusion
    • Faciliated Diffusion
      • Movement of specific molecules via a protein carrier
      • Carrier Proteins
        • Shaped to fit a specific molecule, the protein changes shape to engulf and push the molecule through. GOES AGAINST THE CONCENTRATION GRADIENT
      • Channel Proteins
        • A Pore that can open and close, charged and Large molecules can pass through. GOES WITH THE CONCENTRATION GRADIENT
    • Osmosis
      • Net movement of water across a membrane from a HIGH TO A LOW CONCENTRATION.
      • Water Potential is measured in Kpa and are shown as a trident.
      • When an animal cell is placed in distilled water it bursts (haemolysed)
      • When an animal cell is placed in a concentrated solution the cell shrivles (Crenated)
      • When a Plant cell is placed in distilled water it swells (turgid)
      • When a plant cell is placed in a concentrated solution it shrivles (plasmolysed)
    • Active Transport
      • Uses Energy from ATP
      • Uses carrier proteins
      • Involves the movemnet of molecules from a LOW TO A HIGH CONCENTRATION GRADIENT.
      • Faster and more efficient than Diffusion


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