3 Nose- lined with mucous membranes. Air is warmed, filter and moistened Pharynx or throat- 3 sections: upper, middle and lower. Esophagus branches off hereLarynx- voicebox. Epiglottis closes the opening during swallowingTrachea- windpipe, lined with c-shaped cartilaginous rings
4 Bronchi (singular bronchus)- left and right Bronchioles- smaller divisions of the bronchiBronchioles end in small air sacs called alveoli500 million alveoli- one sqamous cell layer thick
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