Answer :

Events occurring in a reflex action

Explanation:

  • A reflex action is an autonomic response or reaction to a stimulus.
  • This response takes place without any thinking process and allows a person to react automatically to the stimulus received.
  • Sneezing is the autonomic reflex response to some stimulus like exposure to allergic dust, pollens, or any other external agents (nasal irritants) which upon entering the nasal pathway irritates the nasal membranes.
  1. A reflex action is the pathway of the reflex arc which begins with the receptor cells receiving the stimulus.
  2. The sensory neurons of the receptor cells receive the stimulus.
  3. The stimulus is relayed to the motor neuron through the relay neurons.
  4. The motor neuron passes the stimulus to the effector neuron in the organ affected by the stimulus which then produces the response.  
  • Contraction of muscles, sneezing, closing of eyelids, etc are examples of reflex actions.

Answer:

The entire process of response to a peripheral nervous stimulation, that occurs involuntarily is called a reflex action.*It is defined as an inborn, involuntary mechanical response to stimuli.*The reflex pathway comprises atleast one afferent neuron and one efferent neuron appropriately arranged in a series.*The afferent neuron receives signal from a sensory organ and transmits the impulse via a dorsal nerve root into the CNS.*The efferent neuron then carries signals from CNS to the effector.

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