What is the primary action of beta-2 specific drugs?

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Multiple Choice

What is the primary action of beta-2 specific drugs?

Explanation:
Beta-2 specific drugs work by activating beta-2 receptors on smooth muscle, especially in the airways. This triggers a cascade (Gs protein → increased cAMP) that lowers intracellular calcium, causing the smooth muscle to relax. In the lungs, this bronchodilation reduces airway resistance and makes breathing easier, which is the primary therapeutic goal in conditions like asthma. The other effects listed aren’t the main action: tightening smooth muscle would worsen symptoms; increasing heart rate relates more to beta-1 effects; and lowering blood glucose isn’t the primary action of these agents.

Beta-2 specific drugs work by activating beta-2 receptors on smooth muscle, especially in the airways. This triggers a cascade (Gs protein → increased cAMP) that lowers intracellular calcium, causing the smooth muscle to relax. In the lungs, this bronchodilation reduces airway resistance and makes breathing easier, which is the primary therapeutic goal in conditions like asthma. The other effects listed aren’t the main action: tightening smooth muscle would worsen symptoms; increasing heart rate relates more to beta-1 effects; and lowering blood glucose isn’t the primary action of these agents.

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