Beta-blockers primarily act by:
✓ Correct Answer: Option B
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.
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.