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  Alveolar duct and alveolar sacs

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Unit_14-08a

 1. Blood vessel

 2. Alveolar sac

 3. Alveolar duct

 4. Alveolus

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Respiratory bronchioles feed into alveolar ducts, which are formed  by a series of alveoli lying adjacent to one another.  These ducts eventually terminate in groups or clusters of alveoli called alveolar sacs. 

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