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The respiratory zone begins where terminal bronchioles join which structure?
AThe tracheal cartilage
BThe pleural membrane
CA respiratory bronchiole
DA primary bronchus
Answer & Solution
Correct answer: C. A respiratory bronchiole
1. The zones meet at a defined point in the airway tree.
2. Gas exchange occurs in the respiratory zone.
3. The respiratory zone begins where the terminal bronchioles join a respiratory bronchiole.
4. That is the smallest type of bronchiole.
_Source: OpenStax Anatomy and Physiology 2e (CC BY 4.0), Ch 22 'The Respiratory System', sections 22.1-22.6_
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