Normal resting membrane potential of a neuron is_____________?
Correct answer: C. - 70 mv
- A. - 50 mv
- B. - 60 mv
- C. - 70 mv
- D. - 80 mv
Explanation
A neuron's resting membrane potential is approximately -70 mV because the membrane is more permeable to K+ than Na+ and the Na+-K+ pump maintains unequal ion distributions. Students may choose -60 mV or -80 mV because the exact value varies slightly among cells, but -70 mV is the standard value.
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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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