The plasma membrane of a neuron or muscle is said to be [ Select ] ["hyperpolarized", "polarized", "depolarized"] when the outside of the cell carries a net [ Select ] ["positive charge", "negative charge", "neutral charge"] and the inside has a net [ Select ] ["negative charge", "neutral charge", "positive charge"] . This is accomplished by the sodium-potassium pump, that pushes three [ Select ] ["chloride", "calcium", "sodium", "potassium"] ions to the outside of the cell and two [ Select ] ["potassium", "chloride", "calcium", "sodium"] ions to the inside of the cell. When the neuron cell is at rest, the potential difference between the outside and inside of the cell is [ Select ] ["-55 mV", "-70 mV", "+30 mV"] . This is known as [ Select ] ["resting membrane potential", "action potential", "repolarization", "depolarization"] .