Refer to the graph showing the course of an action potential. At which of the numbered points along the graph do voltage-gated sodium channels first open, and what is the result?

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Refer to the graph showing the course of an action potential.  At which of the numbered points along the graph do voltage-gated sodium channels first open, and what is the result?

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The Answer of Refer to the graph showing the course of an action potential.  At which of the numbered points along the graph do voltage-gated sodium channels first open, and what is the result?

Refer to the Graph Showing the Course of an Action