homeostasis + nervous system

• what is homeostasis?


  maintaining a stable internal environment
• our automatic control system is made of what 3 components

  • receptors
  • coordination centres
  • effectors
• the mechanism negative feedback

  1. the receptors detect a stimulus
  2. the coordination centres receive and process info
  3. the effectors bring about a response that counteracts
• homeostasis is either

  • nervous
  • hormonal
• examples of things homeostasis maintains

  • blood glucose levels
  • body temperature
  • urea concentration
  • water content
• the nervous system does what?

  detects and reacts to stimuli
• the nervous system is made up of what 4 components

  • the CNS (brain and spinal cord)
  • sensory neurones
  • motor neurones
  • effectors
• what do sensory neurones do?


  carry info as electrical impulses from the receptors to the CNS
• what do motor neurones do?


  carry electrical impulses from the CNS to the effectors
• what is a synapse?


  the connection between two neurones