Trace the air flow through the respiratory system starting with the external nares. Number the structures 1 through 17.____________ alveolar duct____________ alveolar sac____________ alveolus____________ bronchiole____________ external nares____________ internal nares____________ laryngopharynx____________ larynx____________ nasal cavity____________ nasopharynx____________ oropharynx____________ primary (main) bronchus____________ respiratory bronchiole____________ secondary (lobar) bronchus____________ terminal bronchiole____________ tertiary (segmental) bronchus____________ trachea
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