And this is known as the hyperpolarization period. And this is shown by this period here. Now, when we have the hyperpolarization period, our sodium, potassium, Atpace pump will begin to pump. By using ATP, molecules will begin to pump our three sodiums outside of the cell and potassium into the cell against electrochemical gradient. And that's exactly why we need to use energy. So basically, this will ultimately return our potential of the membrane back to the resting membrane potential of about negative 70 millivolts.