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Hodgkin and Katz proposed that sodium was the predominant ion associated with the firing of an action potential because a. the membrane potential approaches the Na+ Nernst potential during the rising phase. b. the membrane potential approaches the Na+ Nernst potential during the falling phase. c. sodium ions can move more quickly than other ionic species. d. sodium ions are the only ions that can flow into the nerve cell body. e. the sodium gradient explains the rising phase, falling phase, and overshoot of the action potential.

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