Beta-2 receptor stimulation leads to which effects?

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Prepare for the NREMT AEMT Test. Study with flashcards and multiple-choice questions. Each question includes hints and explanations. Get ready for your exam now!

Multiple Choice

Beta-2 receptor stimulation leads to which effects?

Explanation:
Beta-2 receptors are Gs-protein coupled, so their stimulation raises cAMP inside smooth muscle cells. In the airways, higher cAMP lowers intracellular calcium and relaxes bronchial smooth muscle, producing bronchodilation. In vascular smooth muscle of skeletal muscle beds, the same signaling causes relaxation and vasodilation, increasing blood flow to active muscles. This differs from beta-1 effects, which boost heart rate and contractility, and from bronchoconstriction, which is mediated by other receptors like muscarinic (parasympathetic) pathways. So the effects you’d expect with beta-2 stimulation are bronchodilation and vasodilation.

Beta-2 receptors are Gs-protein coupled, so their stimulation raises cAMP inside smooth muscle cells. In the airways, higher cAMP lowers intracellular calcium and relaxes bronchial smooth muscle, producing bronchodilation. In vascular smooth muscle of skeletal muscle beds, the same signaling causes relaxation and vasodilation, increasing blood flow to active muscles. This differs from beta-1 effects, which boost heart rate and contractility, and from bronchoconstriction, which is mediated by other receptors like muscarinic (parasympathetic) pathways. So the effects you’d expect with beta-2 stimulation are bronchodilation and vasodilation.

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