Which of the following pairs concerning action potentials in cardiac muscle is mismatched? A) Opening of Na⁺ channels - depolarization B) Closing of Ca²⁺ channels - plateau phase C) Opening of K⁺ channels - rapid repolarization D) Closure of Na⁺ channels - early repolarization E) Opening of Ca²⁺ channels - plateau phase

Question

Quizplus · Accepted Answer

The mismatched pair is B) Closing of Ca^2+ channels - plateau phase. In reality, the opening of Ca^2+ channels contributes to the plateau phase of the cardiac action potential, not their closing.

Which of the Following Pairs Concerning Action Potentials in Cardiac