Neuron nerve impulse synapse

NCERT Biology Class 11, Chapter 18

Neuron nerve impulse synapse NEET Biology MCQ

Last updated: July 30, 2026

Reviewed by MedQGo Editorial Team | Last updated: July 30, 2026

If the Na+ concentration in the bathing solution of an isolated nerve fiber is reduced, then the overshoot value of the action potential in a single nerve fiber will

Aincrease
Bdecrease
Cremain unchanged
Dfirst increase then decrease

Correct answer: B. decrease

The overshoot value of an action potential is primarily determined by the Na+ channels opening. A reduction in extracellular Na+ concentration will lead to a smaller influx of Na+, thereby reducing the overshoot value.

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