biology 3 chapter 3.1

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Controlling internal conditions 

  • Waste products must be removed from the cells
  • Internal conditions in the body must be kept constant

The human kidney 

  • Chemical reactions in the body produces substances that are toxic eg: urea
  • The kidneys excrete substances that the body does not want
  • The kidneys first filter substances out of the blood, they reabsorb the substances that the body needs.


  • When kidneys fail, the patient can be treated by dialysis
  • A dialysis machine does the work of the kidneys and keeps patients alive


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