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Which structure belongs to the conducting (not respiratory) zone?
Aalveolar duct, just before alveoli
Balveolar sac, the final dead-end
Crespiratory bronchiole, with some alveoli
Dterminal bronchiole, before any alveoli
Answer & Solution
Correct answer: D. terminal bronchiole, before any alveoli
Terminal bronchioles are the last segment of the conducting zone; below them, respiratory bronchioles, alveolar ducts and alveolar sacs all have alveoli embedded in their walls, so they belong to the respiratory zone.
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