GCSE Biology Unit 2 (18)

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  • Homeostasis is the maintenance of a constant internal environment
  • There are six main things that need to be controlled.
  • 1) The body temperature mustn't get too high or low.
  • 2) Water content mustn't get too high or low, or too much water could move in and out of cells and damage them.
  • 3) If the ion content of the body is wrong, the same thing could happen.
  • 4) The blood sugar level must stay within certain limits.
  • The last 2 things are waste products that are constantly produced in the body that you have to get rid of.
  • 5) Carbon dioxide is a product of respiration. It is toxic in high quantities so it has to be removed. It leaves the body by the lungs when you breathe out.
  • 6) Urea is a waste product made from excess amino acids that also has to be removed.
  • Body temperature must be


Stephen Causbrook


Sam groves is a bender :)

Sam Groves


what an absolute ****** above ^ ;)

Alex Butler


fai rplay fair play sam, i have literally copied everything on here hehe



safe sam very helpful

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