Divisions of nervous system

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  • Nervous system
    • peripheral nervous system
      • somatic nervous system
        • controls voluntary movements, receives information from sensory neurons
      • autonomic nervous system
        • sympathetic nervous system
          • turns of fight or flight response, increases heart rate, turns off unnecessary functions, e.g. salvation.
        • parasympathetic nervous system
          • turns off fight or flight response, starts digestion, decreases heart rate, lowers breathing speed
        • controls fight or flight response
      • connects CNS to rest of body
    • central nervous system
      • brain
        • centre of conscious awareness, contains cerebral cortex, which separates us from animals
      • spinal cord
        • relays messages from CNS to PNS, controls reflexes
      • controls behaviour and regulates physiological processes.

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