Short Answer
As the action potential nears its peak,the voltage-gated [dropdown 1] channels close,and voltage-gated [dropdown 2] channels open,allowing cations to flow out of the cell to restore the resting membrane potential.
Dropdown 1& 2 choices:
calcium
chloride
potassium
sodium
Correct Answer:

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1.sodium
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Correct Answer:
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2...
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