Cells, enzymes and life processes function only in certain conditions, and optimally when conditions are within a narrow range. Therefore a constant internal environment is essential for an organism to function properly.

In this topic you need to know about the following: -

  • How temperature is maintained in the body.
  • Hoto investigatechanges in body temperature.
  • How the kidneys maintain water balance (triple science only).
  • Use the arrows below to continue to revise.