The Change in Electrical Charge from -70mV to the Peak

Multiple Choice

The change in electrical charge from -70mV to the peak of the action potential is due to ___ and the change in electrical charge from the peak of +30 or +40mV back to -70mV is due to___.

A) inflow of chloride ions,outflow of sodium ions
B) inflow of potassium ions,outflow of sodium ions
C) inflow of sodium ions,outflow of sodium ions
D) inflow of sodium ions,outflow of potassium ions