alleryStart learning →Which autonomic effect on the airway is correct?
ASympathetic stimulation narrows the bronchioles
BParasympathetic stimulation widens the bronchioles
CSympathetic stimulation has no airway effect
DParasympathetic stimulation narrows the bronchioles
Answer & Solution
Correct answer: D. Parasympathetic stimulation narrows the bronchioles
1. Airway calibre is under autonomic control from both divisions.
2. The parasympathetic system causes bronchoconstriction, which narrows the bronchioles.
3. The sympathetic system stimulates bronchodilation, which widens them.
4. So the fourth option is correct, and the first two swap the two divisions.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.2 The Lungs_
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