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pharynx throat nose esophagus larynx trachea oesophagus lung skull nasopharynx oropharynx structure palate nasal cavity respiration air epithelium columnar goblet cell tonsil anatomy education science isolated tube tongue epiglottis lymph tissue oral swallowing cartilage muscle nerve neck lumen food bone sinus medicine ear tooth digestive vagus anatomical structures surrounding commonly called muscular funnel-shaped passageway inside body connects mouth leading stomach lungs