After entering a room of chemical fog, a 20-year-old male cannot stop coughing. Which of the following structures are primarily responsible for his response?
a. Upper respiratory tract mucosa
b. Irritant receptors in the trachea and large airways
c. Irritant receptors in the nostrils
d. Upper respiratory nasal hairs and turbi-nates
ANS: C
The irritant receptors in the nostrils are responsible for coughing, not those found in the upper respiratory tract mucosa or in the trachea. The cough is not related to stimulation of upper respir-atory nasal hairs or the turbinates.
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