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

The main mechanism for the generation of a fast excitatory postsynaptic potential (fast EPSP) is

Arelease of more neurotransmitter at the presynaptic terminal
Bincreased reactivity of the postsynaptic neuron
Creduced K+ efflux from the postsynaptic membrane
Dincreased Na+ influx into the postsynaptic membrane

Correct answer: D. increased Na+ influx into the postsynaptic membrane

Fast EPSP is primarily generated by an increase in Na+ influx into the postsynaptic membrane, which depolarizes the membrane and triggers the action potential.

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More Neuron nerve impulse synapse MCQs

When a postsynaptic neuron is excited, the action potential generally first erupts in the axon hillock mainly due toDuring 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?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?When an action potential reaches the synaptic terminal, which of the following is a key change that triggers neurotransmitter release?