BIO NMDCAT Neurons

nmdcat.online July 7, 2026

Regarding nerve impulse propagation, the refractory period ensures that the action potential

A. Travels bidirectionally

B. Moves exclusively in one direction

✓

C. Can bypass damaged axonal segments

D. Decreases in amplitude over distance

📝 Explanation

Because the membrane segment immediately behind the advancing action potential is in its refractory period (Na⁺ channels are inactivated), the impulse cannot spread backward, ensuring unidirectional propagation.

📖 Additional Information

Travels bidirectionally
Moves exclusively in one direction
Can bypass damaged axonal segments
Decreases in amplitude over distance

Because the membrane segment immediately behind the advancing action potential is in its refractory period (Na⁺ channels are inactivated), the impulse cannot spread backward, ensuring unidirectional propagation.

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