Air enters the nose and/or mouth., Due to pressure changes, the epiglottis will open to allow air to travel down the larynx and trachea., Air will continue down the trachea and go into each lung via the primary bronchi., Once it goes through the bronchi the tube will continue to branch into smaller bronchioles., The air will reach the end of the bronchiole where the alveoli are found., Gas exchange will occur where oxygen and carbon dioxide will diffuse., Carbon dioxide will leave the body upon the exhale..

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