When the resting potential of a neuron becomes more positive (e.g. ,goes from -70 millivolts to -63 millivolts),this is referred to as:

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When the resting potential of a neuron becomes more positive, it is called depolarization. This occurs when there is an influx of positively charged ions (usually sodium) into the cell, bringing the potential closer to zero and making it more likely for the neuron to fire an action potential.

When the Resting Potential of a Neuron Becomes More Positive