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The nose ----> meatuses--->the pharynx (throat)----->oropharynx ---> laryngopharynx passes food to the esophagus and air to the larynx.----->trachea (windpipe)---->The primary bronchi branch from the trachea to the left and right lungs---->each primary bronchus divides repeatedly into branches of smaller diameters, forming secondary (lobar) bronchi, tertiary (segmental) bronchi, and numerous orders of bronchioles (1 mm or less in diameter), including terminal bronchioles (0.5 mm in diameter) and microscopic respiratory bronchioles----->alveolar ducts are the final branches -----> alveolar duct ----> alveolus ---->the respiratory membrane (the alveolar and capillary walls) is where exchange of gases occur.

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