Which statement accurately describes the action of potassium channel openers?

Show Answers

These drugs reduce the transmembrane calcium current in smooth muscle, leading to prolonged relaxation.These drugs produce a mild reflex response and cause vascular dilation by activating sensitive nerve endings.Their therapeutic benefits mainly arise from hemodynamic effects such as lowering heart rate and blood pressure.They enhance potassium channel permeability, likely targeting ATP-sensitive channels, thereby stabilizing the resting membrane potential of excitable cells.

Explanation

Option A is correct because potassium channel openers decrease calcium influx across smooth muscle membranes, resulting in sustained muscle relaxation. This effect also reduces cardiac contractility. Options B, C, and D describe effects that are either less prominent or inaccurate in relation to potassium channel openers.