What action is most responsible for the resting membrane potential in cardiac muscle cells? A) Movement of K⁺ through voltage-gated K⁺ channels B) Movement of Na⁺ through open Na⁺ channels C) Movement of Ca²⁺ through voltage-gated Ca²⁺ channels. D) Closing of Na⁺ and K⁺ voltage-gated channels

Question

Quizplus · Accepted Answer

The movement of K+ (potassium ions) through voltage-gated K+ channels is most responsible for the resting membrane potential in cardiac muscle cells, as K+ efflux out of the cell is a key factor in establishing the negative charge inside the cell relative to the outside.

What Action Is Most Responsible for the Resting Membrane Potential