Chapter 11, Problem 15CYR

Sequence the following list of events of a neuronal action potential by placing 1 next to the first event, 2 next to the second event, and so on.

a. _______ The activation gates of voltage-gated ${\text{Na}}^{\text{+}}$ channels open, ${\text{Na}}^{\text{+}}$ flood the cytoplasm, and depolarization occurs.

b. _______ ${\text{K}}^{+}$ continue to flow out of the axon until the membrane is hyperpolarized.

c. ________ Local potentials depolarize the membrane to threshold.

d. ________ The inactivation gates of voltage-gated ${\text{Na}}^{\text{+}}$ channels close as voltage-gated ${\text{K}}^{+}$ channels open, ${\text{K}}^{+}$ begin to exit the axon, and repolarization begins.

e. ________ Repolarization continues and Na+ channels return to resting.