GCSE Biology Unit 3

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Gas and Solute Exchange

  • Substances move osmosis, diffusion and active transport.
  • Life processes need gases or other dissolved substances before they can happen.
  • Waste substances also need to move out of the cells so that the organism can get rid of them. 
  • These substances move to where they need to be by diffusion, osmosis and active transport.
  • Diffusion - This is where particles move from an area of high concentration to an area of low concentration. E.g. different gases can simply diffused through one another, like when a…


Jazz M


This was really helpful!!

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