What are reflex actions ?


What are reflex actions ? Give two examples. Explain a reflex arc.


Definition: Reflex actions seem to have evolved quite early in the physiology of animals when complex neuron network for processing had not been evolved. Even after evolution of processing centres, reflex actions have continued to persist because of their more efficiency for quick responses.
Two Examples:

  1. On being pricked or coming in contact with hot surface, hand is withdrawn even before pain is perceived (by brain),
  2. Wider openin0 of pupil in dim light and its narrowing in strong light.

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