Aminophylline relieves dyspnea by:
a. relaxing the smooth muscles of the bronchioles, thereby producing bronchodilation.
b. acting as a beta-2 blocking agent, resulting in bronchodilation.
c. an unknown mechanism.
d. increasing the respiratory rate, thereby making more oxygen available.
ANS: A
Feedback
A Correct: By increasing the concentration of cAMP and relaxing the bronchiole smooth muscles, bronchodilation occurs.
B Incorrect: This is not the action of xanthines.
C Incorrect: We do know the action of xanthines.
D Incorrect: This is not the action of xanthines.
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