Which of the Following Pairs Concerning Action Potentials in Cardiac

Multiple Choice

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