What is the primary mechanism by which nifedipine exerts its effect?

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It primarily relaxes smooth muscles, causing arteriolar dilation and resulting in lowered blood pressure.Nifedipine suppresses the SA node, reducing myocardial excitability.Its main action is to slow down A-V node conduction.It lowers cardiac output, thereby reducing the workload on the heart.

Explanation

Nifedipine mainly acts as a smooth muscle relaxant, leading to dilation of arterioles which decreases blood pressure. It does not primarily affect the SA node, A-V conduction, or cardiac output.