Homeostasis

• Homeostasis

  the regulation of conditions in the body to maintain a stable environment
• things needed to be controlled within the body

  • temperature
  • water balance
  • blood glucose levels
• systems involved in homeostasis

  • nervous system
  • endocrine system
• negative feedback

  a mechanism used where control systems keep internal environments stable
• negative feedback counteracts changes
• stages in a control system

  • stimuli
  • receptor
  • control centre
  • effector
  • response
• a stimuli is a change in environment
• receptors

  detect stimuli
• a control centre co-ordinates responses
• effector

  produces a response
• response

  carries out the commands given
• if levels are high ...

  • receptor detects stimulus level is too high
  • the co-ordination centre receives information & organises response
  • effector produces response
  • response decreases level back to optimum level
• if levels are too low...

  • receptor detects stimulus level is too low
  • the co-ordination centre receives information & organises response
  • effector produces a response
  • response increases levels back to optimum level