In unstimulated stage, a neuron has a membrane potential of:
Correct answer: C. -70mV
- A. -50mV
- B. +50mV
- C. -70mV
- D. +70mV
Explanation
An unstimulated neuron has a resting membrane potential of about minus 70 mV, the inside negative relative to the outside, maintained by the sodium potassium pump and leakage of potassium. A positive value is reached only briefly at the peak of an action potential, and minus 50 mV is close to the threshold for firing.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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About Neurons and Nerve Impulse
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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