Depolarization occurs when:
A. The membrane potential becomes less negative than the resting membrane potential.
B. The membrane potential becomes more negative than the resting membrane potential.
C. Cl– influx hyperpolarizes the membrane.
D. The presynaptic terminal of a neuron is inhibited by another neuron.
E. All membrane channels are closed, preventing the influx of Na+.
ANS: A
Rationale: Sudden changes in membrane potential result from the flow of electrically charged ions through gated channels spanning the cell membrane. The membrane is depolarized when the potential becomes less negative than the resting potential.
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