Now, to return the neuron to return the membrane of the neuron back to the resting membrane potential, which is equal to about negative 70 millivolts. Now, we have to use energy, we have to use ATP, and we have to use a special type of pump, a special type of ATPase pump ATPase pump known as the sodium potential or the potassium sodium ATPase pump. And what the potassium sodium ATPase pump does is it actively pumps three sodiums out of the cell, so against electrochemical gradient and two potassium into the cell against the electrochemical gradient. And this eventually returns our membrane back to the resting membrane potential of around negative 70 millivolts. So, everything we just discussed so far basically is summarized in the following graph. So let's suppose the y axis is our voltage given in millivolts, and the x axis is time.