homeostasis

• what is homeostasis?


  The ability of an organism to maintain a stable internal environment despite external changes.
• why is it important for cells to have the right conditions?

  in order to function properly
• automatic control systems


  nervous and hormonal communications, regulate internal environment
• what are the three components of automatic control systems?

  • receptors
  • co ordination centres (brain, spinal cord, pancreas)
  • effectors
• negative feedback...


  counteracts change
• what is a stimulus?

  a change in the enviroment
• name three things controlled by homeostasis in the body

  • body temperature
  • blood glucose levels
  • water content