alleryStart learning →How do the walls of bronchioles differ from the walls of bronchi?
AThey contain goblet cells but no cilia at all
BThey are muscular and contain no cartilage
CThey contain complete rings of cartilage
DThey are lined by simple squamous cells
Answer & Solution
Correct answer: B. They are muscular and contain no cartilage
1. Bronchi are supported by rings of cartilage that prevent their collapse.
2. Bronchioles have muscular walls and no cartilage at all.
3. That muscular wall can change the size of the tube to increase or decrease airflow, so the second option is correct.
4. The third option states the opposite and would remove the bronchiole's ability to change calibre.
_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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