Question

With the help of diagram, trace the sequence of events occur in reflex action.

Answer 1

Reflex arc is the pathway followed by the nerve impulse to generate a reflex action. It includes receptor, affector or sensory nerve, nerve centre, motor or effector nerve and effector organ like muscles
Sneezing occurs when a foreign particle irritant irritates the nasal passage. The sequence of events that take place during sneezing are as follows:-

1-  Nerve endings located in the nasal passage identifies the irritant entered in the nose
                                                               
Receptor sends the information or nerve impulse to the sneezing centre located in brain stem
                                                               
 2-   Brain stem in return sends instructions to the lungs or diaphragm for response
                                                               
3- Diaphragm moves abruptly, chest muscles contract in response to the instructions received
                                                                  4- Air blows out from nose and mouth instantly and rapidly
                                                               
5-  Sneezing occurs in response to the irritant

Answer 2

Answer:

-NOSE

-LUNGS

-DIAPHRAGM

-EYEs

Explanation:

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