Question:
Respiratory bronchioles terminate into
Respiratory bronchioles terminate into
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Respiratory bronchiole → Alveolar duct → Alveolar sac.
Updated On: Jul 18, 2026
- Tertiary bronchi
- Alveolar sacs
- Alveolar ducts
- Primary bronchi
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The Correct Option is C
Solution and Explanation
Step 1: Understanding respiratory bronchioles.
Respiratory bronchioles are part of the lower respiratory tract. They act as transitional passages between terminal bronchioles and alveolar structures.
Step 2: Functional significance.
They are the first region where actual gas exchange begins. Their walls contain scattered alveoli that help in respiration.
Step 3: Continuation of airway.
Respiratory bronchioles continue into alveolar ducts, which are more extensively lined with alveoli. This increases surface area for gas exchange.
Step 4: Evaluation of options.
Tertiary and primary bronchi are part of conducting zone, not gas exchange region. Alveolar sacs are terminal structures after alveolar ducts.
Step 5: Structural transition.
The respiratory bronchiole gradually loses its epithelial structure and merges into alveolar ducts for efficient diffusion.
Step 6: Final conclusion.
Thus, respiratory bronchioles terminate into alveolar ducts.
Respiratory bronchioles are part of the lower respiratory tract. They act as transitional passages between terminal bronchioles and alveolar structures.
Step 2: Functional significance.
They are the first region where actual gas exchange begins. Their walls contain scattered alveoli that help in respiration.
Step 3: Continuation of airway.
Respiratory bronchioles continue into alveolar ducts, which are more extensively lined with alveoli. This increases surface area for gas exchange.
Step 4: Evaluation of options.
Tertiary and primary bronchi are part of conducting zone, not gas exchange region. Alveolar sacs are terminal structures after alveolar ducts.
Step 5: Structural transition.
The respiratory bronchiole gradually loses its epithelial structure and merges into alveolar ducts for efficient diffusion.
Step 6: Final conclusion.
Thus, respiratory bronchioles terminate into alveolar ducts.
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