Biological Bases of Behavior and Psychophysiology Practice Questions | GRE Subject Test Psychology

Biological Bases of Behavior and Psychophysiology

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A neuron is at rest. A strong stimulus triggers an action potential. A second, even stronger stimulus is applied immediately after the peak, while the membrane is still in the absolute refractory period. What outcome is expected?

Select one option.

A second action potential occurs but with smaller amplitude because fewer Na\(^+\) channels are open.
A second action potential occurs with normal amplitude but cannot propagate past the first node.
No second action potential occurs because K\(^+\) channels are open and K\(^+\) efflux blocks any depolarization.
A second action potential occurs, but it propagates only backward toward the soma.
No second action potential occurs, even with stronger stimulation, because most voltage-gated Na\(^+\) channels are inactivated.

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