The diaphragm contracts., Oxygen-rich air is inhaled through the nasal cavity or mouth., Oxygen-rich air enters the pharynx., Oxygen-rich air passes the larynx and enters the trachea., Oxygen-rich air splits into either the left or right bronchus., Oxygen-rich air enters either the left or right lung and travels through the bronchioles., Oxygen-rich air is exchanged with carbon dioxide in the alveoli., The diaphragm relaxes., Carbon dioxide enters the bronchioles in the left or right lung., Carbon dioxide leaves the lungs and enters the left or right bronchus., Carbon dioxide travels up through the trachea and passes the larynx., Carbon dioxide enters the pharynx. , Carbon dioxide exits the body through the nasal cavity or mouth..

Pathway of Airflow

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