Pharmacology and the Nursing Process by Linda Lane Lilley: Practice Exam

Question: 1 / 400

What mechanism do Xanthine derivatives use to cause bronchodilation?

Blocking ACh receptors

Inhibiting phosphodiesterase to increase cAMP

Xanthine derivatives such as theophylline work by inhibiting the enzyme phosphodiesterase, which is responsible for breaking down cAMP, a chemical messenger that helps relax the smooth muscles in the airways and promote bronchodilation. Option A is incorrect because blocking ACh receptors would actually have the opposite effect and cause bronchoconstriction. Option C is incorrect as xanthine derivatives do not have a direct effect on blood glucose levels. Option D is also incorrect as xanthine derivatives do not stimulate the release of epinephrine, although they can be used in combination with epinephrine in certain situations.

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Decreasing blood glucose levels

Stimulating the release of epinephrine

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