Movement in & out of cells

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Diffusion is defined as the net movement of molecules from a region of their higher concentration to a region of their lower concentration down a concentration gradient until equilibrium is reached.

Factors affecting rate of diffusion are:

  • temperturewith increasing temperature, molecules gain more kinetic energy and hence they move faster. Therefore the rate of diffusion increases.                                            
  • size/mass of moleculesthe smaller the molecules, the faster is the rate of diffusion.
  • surface area-   with increasing surface area, the rate of diffusion increases.
  • concentration gradient-   the higher the concentration, the faster is the rate of diffusion.

Importance of diffusion to living organisms are:

  • gaseous exchange across


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