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Which of the following is the main reason that the opening of sodium channels causes a very rapid depolarization of most neurons? a. The movement of a sodium ion produces a larger voltage change than the movement of other ions. b. Sodium ion diffusion proceeds so quickly that whenever sodium channels are open, there is a rapid directional flux across the membrane. c. The conjunction of the sodium gradient and the negative membrane potential produces a very large driving force on sodium ions. d. All of the above e. None of the above
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