Page 5 - Pert_3_Neat
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1) Provides rigid structures for air to

                                                                                                              reach the sites of gas exchange



                                             Conducting zones                                           2) Includes all other respiratory
                                                                                                              structures (e.g., nose, nasal cavity,


                                                                                                              pharynx, trachea)







                 Functionally









                                                                                                         1) Site of gas exchange

                                                   Respiratory zone                                      2) Consists of bronchioles, alveolar



                                                                                                              ducts, and alveoli
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