A large humidity deficit will cause:

a. a nonproductive cough. c. increased move-ment of mucus.
b. increased cilia func-tion. d. decreased airway resistance.

ANS: A
When the airways are exposed to dry, cold air, ciliary motility is reduced; the airways become more irritable; and because mucous production is increased, pulmonary secretions become thick and inspissated, with increased airway resistance and a nonproductive cough.