The inside of the cell contains more potassium ions than the outside does. The system as a whole is electrically neutral because an anion balances out each potassium ion (on either side of the membrane).
A neuron is negatively charged when it is at rest because a cell's interior is roughly 70 millivolts (mV) more negatively charged than its exterior. Potassium concentrations within cells are higher than those outside of them. Potassium ions move outward while sodium, calcium, and chloride ions flow inward under the control of concentration forces.
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