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Manske, Magnus. "Schematic of an Action Potential." Digital image. Wikimedia Commons. Web. N.p., 24 Feb. 2009.

Action potential, the electrical signal within nerve cells, is generated by the movement of ions through gated channels.

Both sodium ions and potassium ions move through the membrane during the process. However, the first step in generating action potential is a signal traveling across the synapse from one neuron to another.

Which of the following describes this signal?


Calcium ions.


Dendritic secretions.


Myelin particles.


Neurotransmitter molecules.

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