The polarization of a neuron results in a resting potential of about -70 millivolts. This is followed by depolarization, resulting in an action potential of +110 millivolts. This brings the membrane voltage to

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The resting potential of a neuron is -70 millivolts, and depolarization during an action potential brings the voltage up to +110 millivolts. Thus, the difference between the two is 110 - (-70) = 180 millivolts. However, the question is asking for the membrane voltage after depolarization, not the difference between resting potential and action potential. Therefore, we need to add the depolarization voltage (+110 millivolts) to the resting potential (-70 millivolts) to get the final membrane voltage: -70 + 110 = +40 millivolts. So, the correct answer is A, +40 millivolts.

The Polarization of a Neuron Results in a Resting Potential