The nasopharynx is lined with a ciliated mucosal membrane with a highly vascular blood supply. One function of this membrane is to:
a. absorb air.
b. humidify air.
c. cool air.
d. exchange gases.
ANS: B
These structures are lined with a ciliated mucosa that warms and humidifies inspired air and re-moves foreign particles from it. Air is not absorbed or cooled by the ciliated mucosal membrane. Gas exchange occurs in the alveoli.
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