Diffusion - Biology Revision

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Diffusion - Biology Revision


  • Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration.
  • Diffusion happens in both solutions and gases - thats because the particles in these substances are free to move about randomly.
  • Dissolved substances can move in and out of cells by diffusion.
  • Only very small molecules can diffuse through cell membranes though - things like oxygen, glucose, amino acids and water.
  • Big molecules like strach and proteins can't fit through the membrane.
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