A Neuron Is Exposed to a Drug That Completely Blocks

Multiple Choice

A neuron is exposed to a drug that completely blocks voltage-gated potassium channels, but has no effect on non-gated channels or the sodium-potassium pump. Which of the following describes the effect on action potential generation?

A) Threshold will never be crossed, and therefore an action potential will never be generated.
B) Repolarization will never occur after threshold is crossed and sodium will continue to flow into the neuron.
C) Repolarization will still occur, but at an inefficiently slow rate.
D) Resting potential would not be maintained, as potassium could not leak out of the neuron.