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

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What mechanism is primarily associated with beta agonists' effect on the lungs?

  1. Reduction of cAMP levels

  2. Stimulation of beta2-adrenergic receptors

  3. Blocking of alpha receptors

  4. Inactivation of adenylate cyclase

The correct answer is: Stimulation of beta2-adrenergic receptors

Beta agonists primarily work by stimulating beta2-adrenergic receptors in the lungs, causing relaxation of the airway muscles and opening up the airways. A is incorrect because beta agonists actually increase cAMP levels. C is incorrect because blocking alpha receptors does not have an effect on the lungs. D is incorrect because inactivation of adenylate cyclase would decrease cAMP levels, which is opposite of what beta agonists do.

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