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

When an action potential reaches the synaptic terminal, which of the following is a key change that triggers neurotransmitter release?

ANa+ influx

BCa2+ influx

CK+ efflux

DCl- efflux

Correct answer: B. Ca2+ influx

Calcium ions (Ca2+) influx into the synaptic terminal is a key change that triggers neurotransmitter release.

Free PDF sample

Get NEET Biology MCQs as a chapter-wise PDF.

Join early access for a free MCQ sample with answers and NCERT-aligned explanations.

More Neuron nerve impulse synapse MCQs

When a postsynaptic neuron is excited, the action potential generally first erupts in the axon hillock mainly due to During a reflex activity, after the stimulus stops, the motor nerve fiber can still generate action potentials. Physiology describes this phenomenon using which of the following concepts?The main mechanism for the generation of a fast excitatory postsynaptic potential (fast EPSP) is In the central nervous system, which type of glial cell forms myelin sheaths?Which of the following changes can directly reduce the release of neurotransmitters at the synaptic terminal due to an action potential?