At the Beginning of an Action Potential, Sodium Moves

question 72

Multiple Choice

 At the beginning of an action potential, sodium moves

• A) slowly into the cell, because electrostatic pressure is offset by diffusion.
• B) rapidly into the cell, because both electrostatic pressure and diffusion operate at the same time.
• C) slowly out of the cell, because as a positive ion, sodium remains attracted to the relatively negative intracellular environment.
• D) rapidly out of the cell, because the sodium-potassium pumps are very active.

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