5. Factors affecting membrane permeability



  • some solvents dissolve in the lipids, so the membrane loses its structure
  • some solvents increase membrane permeability more than others [e.g. ethanol increases the membrane permeability more than ethanol]
  • increasing the concentration of the substance also increases the membrane permeability.



  • below 0 degrees C
    • phospholipids dont have much energy, so can't move much
    • closely packed


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