Process of an Action Potential

A neuron communicates by sending an action potential down its axon and releasing neurotransmitter. Which of the following correctly describes the process of an action potential. (1) rapidly enters the cell causing a depolarization, followed by the efflux of (2), which repolarizes the cell. Once the action potential reaches the presynaptic terminal, (3) enters the cell, which causes the release of neurotransmitter?

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