What may happen if the irritant receptors in the lung are stimulated? 1. Bronchoconstriction 2. Reflex closure of the glottis 3. Reflex slowing of the heart (bradycardia)

a. 2 and 3 only
b. 1 and 3 only
c. 2 only
d. 1, 2, and 3

ANS: D
When the irritant receptors are stimulated, it can result in bronchoconstriction, hyperpnea, glottic closure, cough, and sneeze. Stimulation of these receptors can also cause a reflex slowing of the heart rate (bradycardia).