Communication and Homeostasis

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  • A communication system between receptors and effectors , which may be far apart from one another, allows the organism to: 
  • Monitor changes in the internal and external environment. 
  • Respond adaptively to such changes 
  • Coordinate the activities of different organs


  • Homeostasis is the maintenance of a relatively stable internal environment within an organism. This provides relatively constant conditions for the individual cells, even when the external environment fluctuates or the organism changes its behaviour.
  • Homeostasis requires:
  • receptor (sensor or detector) that recieves information (input)
  • A control mechanism that responds to information and stimulates an effector.
  • An effector to perform the appropriate action.
  • Input > receptor > control mechanism > effector > output >


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