Homeostasis

• What is homeostasis?


  Homeostasis is the maintenance of a constant internal environment in order to maintain optimum conditions for enzyme and cellular function.
• Give examples of conditions maintained by homeostasis in the body

  • blood glucose concentration
  • body temperature
  • water levels
• What two types of responses are used in body control systems?

  Nervous and chemical
• What three components do all control systems have?

  • receptors
  • coordination centres
  • effectors
• What is the function of a receptor?


  Receptors detect changes in the environment (stimuli).
• What is the function of a coordination centre? (CNS)

  Coordination centres obtain and process information from receptors
• What is the function of an effector?


  Effectors (muscles or glands) bring about responses to stimuli.
• mnemonic for the reflex arc

  Sir - stimulus (ie spike ect)

  Really - receptor (cells in skin)

  Should - sensory neuron

  Catch - CNS (central nervous system) - brain and spinal cord

  More - motor neuron

  Easter - Effector (muscles or glands)

  Rabbits - response