The reflex arc

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  • Created by: alexda
  • Created on: 08-05-14 16:34
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  • The Reflex Arc
    • Reflexes are automatic responses to a stimulus so they reduce the chances of being injured.
    • The neurones in reflex arcs go through the spinal cord or through an unconscious part of the brain.
    • 1. When a stimulus is detected by receptors impulses are sent along a sensory neurone to the CNS.
      • 2. In the CNS the sensory neurone passes the nerve impulse to a relay neurone which relay the impulses to a motor neurone.
        • 3. The impulses then travel along the motor neurone to an effector which responds (e.g. muscle contracts)
    • The reflex arc is quicker than a normal response because you don't have to think about it.


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