Branches of the nervous system, which can cause relaxation of airway smooth muscle, include which of the following? 1. Sympathetic nerves 2. Parasympathetic nerves 3. Nonadrenergic, noncholinergic (NANC) inhibitory nerves
a. 1 only
b. 2 only
c. 1 and 2 only
d. 1, 2, and 3
ANS: D
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