Answer:
The inward flow of sodium ions increases the concentration of positively charged cations in the cell and causes depolarization, where the potential of the cell is higher than the cell's resting potential. The sodium channels close at the peak of the action potential, while potassium continues to leave the cell.
A condom. Hopefully I answered in time.
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It would be activities that increase the size of the muscle cells and the amount of blood that is delivered to the muscle.
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