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Preksha Dhyana :
ing and sneezing are protective reflex mechanism used to clear the respiratory passages. A cough serves to clear the trachea and bronchi while sneeze serves to clear the passages of the nose and the mouth. A sigh is a deep long-drawn inspiration immediately followed by a shorter but forceful expiration. A yawn is a deep inspiration through a wide open mouth. It produces a more complete ventilation of the lungs than usual.
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