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A respiratory bronchiole leads to an alveolar duct, which opens into a cluster of:
AThe alveoli
BThe bronchi
CThe pleurae
DCapillaries
Answer & Solution
Correct answer: A. The alveoli
1. The airway ends in the gas exchange surfaces.
2. A respiratory bronchiole leads to an alveolar duct.
3. That duct opens into a cluster of alveoli.
4. Gas exchange takes place across the alveolar wall.
_Source: OpenStax Anatomy and Physiology 2e (CC BY 4.0), Ch 22 'The Respiratory System', sections 22.1-22.6_
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