Movement of molecules

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  • Created by: Ammara.j
  • Created on: 10-10-16 16:37
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  • Movement of Molecules
    • Types of fluids
      • ICF (Intracellular fluid)
        • This is the fluid found inside of cells. Makes up 66% of body water (2/3)
      • ECF (Extracellular Fluid)
        • This is the fluid found outside of cells. Makes up 1/3 of body water. 75% of that is in the interstatial fluid. 25% is in the plasma.
    • Diffusion
      • Diffusion-The random movement of molecules from an area of high concentration to a low concentration until equilibrium is reached.
      • Properties of diffusion
        • Diffusion occurs at a higher rate over smaller distance than over larger distances. The equation for rate it is:   Diffusion time  (Distance)^2
        • Dependent on temperature. Higher temp = faster rate of diffusion
        • Passive. Doesn't use energy from external sources e.g the surroundings. Only K.E in molecules.
        • Larger Surface area means more diffusion than a smaller
        • The medium. Diffusion occurs at a higher rate in air than water
        • Mass, membrane permeability and concentration gradient also effect diffusion.
      • Flux- The movement of molecules in one direction. one place to another.
    • Osmosis
      • Osmosis is the movement of water from a higher concentration to a lower concentration across a partially permeable membrane.
    • Osmolarity
      • Hyper osmotic- Higher concentration of solute
      • Iso osmotic- Same concentration of solute
      • Osmolarity-Number of particles of solute per litre of solution.


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