The nervous system and reflex actions

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The nervous system

The nervous system - Enables you to co-ordinate your behaviour and react to your surroundings

  • (electrical) Impulses carry message very quickly around your body so you can react quickly to different situations.
  • Changes to you or your surroundings are called stimuli e.g. loud noise, touching a hot oven.
  • These changes are picked up by cells called receptors which in clusters are called sense organs e.g. ears, eyes, skin

How it works

  • Once the receptors have detected a stimuli an (electrical) impulse is sent up a sensory neuron until it reaches


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