GCSE Biology Unit 2 (3)

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  • Diffusion is a simple process.
  • It's just the gradual movement of particles from an area where there's a lot of them to places where there are fewer of them.
  • It is just the natural tendency for stuff to spread out.
  • The actual definition is:
  • Diffusion is the passive movement of particles from an area of high concentration to an area of low concentration.
  • Diffusion happens in both liquids and gases - that's because the particles in both these substances are free to move about randomly.
  • The simplest type is when different gases diffuse through each other.
  • The bigger the concentration, the faster the rate of diffusion.
  • Cell membranes are quite clever
  • They are clever because they hold the cell together BUT they…


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