structure & function of the human nervous system

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  • structure & function of the human nervous system
    • receptor cells detect stimuli
      • found in sense organs eg: eye, ear, nose, tongue & skin
        • in the eye light stimulates receptors
          • electrical impulses then pass to the brain along neurones (nerve cells)
        • other stimulis include: sound, chemicals, temperature changes, touch and pain
          • the brain coordinates responses to many stimuli
    • central nervous system
      • brain & spinal cord form it
      • nerves contain budles or neurones
        • sensory neurones carry impulses from receptors to the CNS
        • motor neurones carry impulses from the CNS to effectors that respond to the impulses
          • effectors may be muscles or glands
            • muscles respond by contracting
            • glands respond by secreting (releasing) chemicals
      • stimulis
        • receptor
          • sensory neurone
            • coordinator (CNS)
              • motor neurone
                • effector
                  • response


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