During an action potential, sodium ions
A. rush out of the cell, switching the potential to +35 mV.
B. rush into the cell, switching the potential to ?70 mV.
C. rush into the cell, switching the potential to +35 mV.
D. rush out of the cell, switching the potential to ?70 mV.
E. rapidly move in and out of different parts of the neuron, oscillating potential between ?50 and +35 mV.
C. rush into the cell, switching the potential to +35 mV.
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