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block9_28.jpg - Fig 13. Lung (NO-6-b)The respiratory bronchiole (RB) has a wall composed of two portions of different thickness. The most distal component of the respiratory passage is the alveolus. Groups of alveoli are clustered together sharing a common opening and are referred to as the alveolar sac (AS). Alveoli that form a tube are referred to as alveolar ducts (AD).

Fig 13. Lung (NO-6-b) The respiratory bronchiole (RB) has a wall composed of two portions of different thickness. The most distal component of the respiratory passage is the alveolus. Groups of alveoli are clustered together sharing a common opening and are referred to as the alveolar sac (AS). Alveoli that form a tube are referred to as alveolar ducts (AD).
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