A Neuron Is Exposed to a Drug That Completely Blocks

question 16

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.

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