Question

Trance the events occuring in a reflex action as sneezing.

Answer 1

Dust particles or any other irritant enter in the body through nose. Receptors in the nasal passageways, sense the irritant and sensory nerves carry these impulses to the sneezing center in our brain stem which sends its instructions to lungs and diaphragm for contraction through motor neuron. Nasal passageways secrete fluid. Diaphragm moves abruptly, causing us to take a deep breath. Then muscles in our chest contract, causing the air containing source of irritation to leave our nose and mouth suddenly and rapidly.