Question

question 3 of 5

an electrical impulse is being transmitted along a nerve axon. what would resist electrical stimulation?

schwann cells
synapse
nodes of ranvier
myelin

Explanation:

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"Myelin Insulation",
"Saltatory Conduction"
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"Myelin Insulation",
"Schwann cells"
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<reasoning>

Analyze the electrical properties of the axon components

The question asks what would resist electrical stimulation along a nerve axon.

• Schwann cells are glial cells that produce myelin in the peripheral nervous system, but the myelin sheath itself acts as the physical electrical insulator.
• The synapse is the junction between neurons where chemical or electrical transmission occurs, not a structural component along the axon resisting local electrical stimulation.
• Nodes of Ranvier are unmyelinated gaps containing high densities of voltage-gated sodium channels that facilitate, rather than resist, electrical depolarization.
• Myelin is a lipid-rich substance that wraps around the axon, acting as an electrical insulator. It increases electrical resistance across the axonal membrane, preventing current leakage and forcing the action potential to jump between nodes.

Identify the correct option

Myelin directly resists the flow of electrical current across the axonal membrane, acting as an insulator.
</reasoning>

<answer>
<mcq-option>Schwann cells</mcq-option>
<mcq-option>Synapse</mcq-option>
<mcq-option>Nodes of Ranvier</mcq-option>
<mcq-correct>Myelin</mcq-correct>
</answer>

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Answer:

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"Myelin Insulation",
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</pre_analysis>

<reasoning>

Analyze the electrical properties of the axon components

The question asks what would resist electrical stimulation along a nerve axon.

• Schwann cells are glial cells that produce myelin in the peripheral nervous system, but the myelin sheath itself acts as the physical electrical insulator.
• The synapse is the junction between neurons where chemical or electrical transmission occurs, not a structural component along the axon resisting local electrical stimulation.
• Nodes of Ranvier are unmyelinated gaps containing high densities of voltage-gated sodium channels that facilitate, rather than resist, electrical depolarization.
• Myelin is a lipid-rich substance that wraps around the axon, acting as an electrical insulator. It increases electrical resistance across the axonal membrane, preventing current leakage and forcing the action potential to jump between nodes.

Identify the correct option

Myelin directly resists the flow of electrical current across the axonal membrane, acting as an insulator.
</reasoning>

<answer>
<mcq-option>Schwann cells</mcq-option>
<mcq-option>Synapse</mcq-option>
<mcq-option>Nodes of Ranvier</mcq-option>
<mcq-correct>Myelin</mcq-correct>
</answer>

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