Under resting membrane potentials:
Correct answer: A. Outer surface of neuron is more positive
- A. Outer surface of neuron is more positive
- B. Inner surface of neuron is more positive
- C. Both of these surfaces are equally positive
- D. none of these.
Explanation
During the resting state, the outside surface of the neuron is relatively positive and the inside is relatively negative because of ion distribution and selective membrane permeability. Students may choose option d because both surfaces contain positive and negative ions, but their electrical charges are not equal across the membrane.
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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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