{B1} {The Nervous System} 2

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  • Created by: Em
  • Created on: 22-12-12 18:45


Voluntary actions are under the conscious control of your brain, i.e you decide how to react to a stimulus. For example, tasting something bitter (stimulus) and spitting it out (response).

Reflex actions bypass your brain to give fast, automatic responses to a stimulus, to protect your body, e.g:  

  • pupil reflex automatically controls light entering your eye, to prevent damage to the retina.
  • knee jerk reaction. 
  • automatically withdrawing your hand from a hot plate to prevent you from getting burned.


Your iris, controls the amount of light that enters your eye. The rays of


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