Inhalation of dry gases can do which of the following? 1. Increase viscosity of secretions. 2. Impair mucociliary motility. 3. Increase airway irritability
a. 1 and 2 only
b. 3 only
c. 1 and 3 only
d. 1, 2, and 3
ANS: D
As the airway is exposed to relatively cold, dry air, ciliary motility is reduced, airways become more irritable, mucous production increases, and pulmonary secretions become inspissated (thickened due to dehydration).
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