Which letter indicates the structure that acts as an insulator and what is the name of that structure?

Question

BlackTom AI · Accepted Answer

To tackle this question, I’ll examine each labeled part and recall the biological role of the structure.
Option A: axon. The axon is the long projection that transmits electrical impulses away from the neuron’s cell body. While essential for signal conduction, it is not primarily an insulating structure; its insulating function is provided by another component wrapped around it. This makes A incorrect for the stated insulator.
Option C: dendrites. Dendrites receive signals from other neurons and relay them toward the cell body. They are not known for insulation; their main role is input reception, so C doesn’t fit the description of an insulating structure.
Option D: myelin sheath. The myelin sheath is a lipid-rich layer that wraps around many axons, forming insulation. This insulation increases conduction speed via saltatory conduction and reduces current leakage, which directly matches the idea of an insulating structure.
Option B: myelin sheath. While this option also names the insulating structure, note that the letter given in the prompt is D for the insulator, not B. Since the question asks which letter indicates the insulating structure, the correct letter must correspond to the myelin sheath as shown in the diagram. If the diagram marks D as the insulating layer, then D is the correct choice.
Across all choices, the core concept is that the myelin sheath serves as an electrical insulator around the axon, boosting signal transmission efficiency. The only options that mention myelin sheath are B and D, but the diagram’s label for the insulator is D, not B.
Thus, the reasoning points to D as the insulator label, with the structure being the myelin sheath.

Which letter indicates the structure that acts as an insulator and what is the name of that structure? 单项选择题

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