alleryStart learning →What is an alveolar sac?
AA tube of smooth muscle and connective tissue
BA pore that links two neighbouring alveoli
CA macrophage that patrols the alveolar wall
DA cluster of many individual alveoli
Answer & Solution
Correct answer: D. A cluster of many individual alveoli
1. An alveolus is one small grape-like sac attached to an alveolar duct.
2. An alveolar sac is a cluster of many individual alveoli responsible for gas exchange.
3. So the fourth option is correct.
4. A tube of smooth muscle and connective tissue describes the alveolar duct instead, which is the first option's trap.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.1 Organs and Structures of the Respiratory System_
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