Which of the following occurs first during an action potential?
A)Many sodium ions flow into the neuron.
B)Voltage-gated sodium channels open.
C)A local disturbance triggers the resting voltage to reach the threshold level.
D)The interior of the neuron becomes positive.
E)The interior of the neuron becomes negative.

Question

Quizplus · Accepted Answer

The action potential is initiated when a local disturbance, such as the binding of a neurotransmitter or a sensory stimulus, causes the resting voltage of the neuron to reach the threshold level. This triggers the opening of voltage-gated sodium channels and the influx of sodium ions, leading to depolarization of the neuron and the initiation of the action potential. The interior of the neuron becomes positive during the peak of the action potential, after the influx of sodium ions, and then becomes negative again as potassium ions flow out of the neuron during repolarization.

Which of the Following Occurs First During an Action Potential