Beta-blockers primarily act by: | One Paper Preparation

A) Increasing heart rate

B) Blocking beta-adrenergic receptors, reducing heart rate, contractility, and blood pressure

C) Increasing blood pressure

D) Dilating bronchioles

Explanation

Beta-blockers: antagonize beta-1 (cardiac) receptors → decreased HR, contractility, and AV conduction. Non-selective also block beta-2 (bronchial smooth muscle) → contraindicated in asthma.

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