Two Electrodes, One on Either Side of the Cell Membrane

question 177

Multiple Choice

Two electrodes, one on either side of the cell membrane of a resting neuron, show a difference of about ‒65 mV.If the value changes quickly to about +50 mV and then rapidly returns to ‒65 mV, the most likely explanation is that

• A) the cell membrane briefly became hyperpolarized.
• B) a graded potential passed by the electrodes.
• C) an action potential was triggered by changes in voltage-gated Na⁺ and K⁺ channels.
• D) voltage-gated Na⁺ channels closed, causing a spike of depolarization, and then opened again.
• E) leak K⁺ channels opened and then closed.

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