EVENTS DURING EXCITATION

• DEPOLARIZATION EXCEEDS THRESHOLD

• SODIUM CHANNELS OPEN

• MEMBRANE POTENTIAL SHIFTS FROM POTASSIUM CONTROLLED (-90 MV) TO SODIUM CONTROLLED (+60 MV)

• AS MEMBRANE POTENTIAL REACHES THE SODIUM POTENTIAL, THE SODIUM CHANNELS CLOSE AND ARE INACTIVATED

• POTASSIUM CHANNELS OPEN TO REPOLARIZE THE MEMBRANE

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