1. the introduction of air into the body-cavity-Rouge > anal mucus from nose (nasal cavity) throat (pharynx), the voice box (larynx) neck, windpipe (trachea), lungs, trachea or windpipe pole (bronchus) and FOI (bronchiole)2. where gas exchange occurs--> windpipe opening gas exchange resembles a small bags (pulmonary-alveoli), which can cause gas exchange.
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