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Write short notes on:

Reflex action

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  • An immediate and involuntary response given to a stimulus from the environment is called a reflex action. 
  • Sometimes we react to an incident without any thinking on our part or control over the reaction. 
  • This is a response given to a certain stimulus from the surroundings. 
  • In such situations, proper control and coordination is achieved even without the intervention of the brain. 
  • For example, when our hand touches a hot object, the receptor in the skin detects the stimulus. 
  • The sensory neuron sends the impulse to the relay neuron in the spinal cord. 
  • The impulses are then sent to motor neurons which cause the muscles of the hand to contract and move away from the hot object.
  • The spinal cord is the center of co-ordination for reflex actions.

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