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

Which of the following changes can directly reduce the release of neurotransmitters at the synaptic terminal due to an action potential?

AIncrease in Na+ influx, prolonging the duration of the action potential
BDecrease in Ca2+ influx
CSlowing down K+ efflux
DIncrease in Ca2+ channel permeability

Correct answer: B. Decrease in Ca2+ influx

A decrease in Ca2+ influx directly reduces the release of neurotransmitters at the synaptic terminal. Na+ influx and its prolongation, slowing K+ efflux, and increasing Ca2+ channel permeability do not directly reduce neurotransmitter release.

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