What Axonal Characteristic Facilitates the Propagation of an Action Potential

question 18

Multiple Choice

What axonal characteristic facilitates the propagation of an action potential along a myelinated axon?

• A) Voltage-gated Na+ and K+ channels are concentrated in the myelinated axonal segments.
• B) Voltage-gated Na+ and K+ channels are concentrated in the unmyelinated axonal segments.
• C) Voltage-gated Na+ channels are concentrated in the myelinated axonal segments; voltage-gated K+ channels are concentrated in the unmyelinated axonal segments.
• D) Voltage-gated K+ channels are concentrated in the myelinated axonal segments; voltage-gated Na+ channels are concentrated in the unmyelinated axonal segments.
• E) Voltage-gated Na+ K+ channels are spread evenly throughout both myelinated and unmyelinated segments.

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