Which of the following describes the mechanism for the formation of the repolarization phase in a nerve fiber action potential?
Correct answer: C. Na+ channels deactivate and K+ channels activate
During the repolarization phase of an action potential in a nerve fiber, sodium (Na+) channels deactivate while potassium (K+) channels become active. This leads to the efflux of potassium ions and helps restore the resting membrane potential.