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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