Airway hyperresponsiveness in asthma is related to:
a. increased sympathetic nervous system re-sponse.
b. the release of stress hormones.
c. exposure to an allergen causing mast cell degranulation.
d. hereditary decrease in IgE responsiveness.
ANS: C
Hyperresponsiveness is due to mast cell degranulation. An increased sympathetic response would lead to bronchiolar dilation. Hyperresponsiveness is not due to release of stress hormones. Hered-ity is associated with asthma, but the problem is the mast cells.
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