PATHOLOGY MCQ
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A “resting” motor neuron is expected to
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releases lots of acetylcholine.
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to have high permeability to sodium ions.
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to be equally permeable to sodium and potassium ions.
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have a higher concentration of sodium ions on the inside the cell than on the outside.
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exhibit a resting potential that is more negative than the “threshold” potential.
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Explanation:
Detailed explanation-1: -The inside of the neuron is more negatively charged than the outside. Figure 4.1. For a typical neuron at rest, sodium, chloride, and calcium are concentrated outside the cell, whereas potassium and other anions are concentrated inside. This ion distribution leads to a negative resting membrane potential.
Detailed explanation-2: -If the inside of the cell becomes less negative (i.e., the potential decreases below the resting potential), the process is called depolarization.
There is 1 question to complete.