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

In an in vitro experiment, gradually replacing the Na^+ in the bathing solution with glucose, the amplitude of the action potential in a neuron or nerve fiber will

Agradually increase
Bgradually decrease
Cremain unchanged
Dfirst increase then decrease

Correct answer: B. gradually decrease

The presence of Na^+ ions is crucial for the generation and propagation of action potentials. Gradual replacement with glucose, which does not contribute to the depolarization process, will reduce the amplitude of 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 toIf 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 willWhich of the following membrane potentials is entirely determined by the intrinsic electrical properties of the membrane without activation of ion channels?During the depolarization phase of an action potential in a nerve fiber, the membrane potential value exceeding 0mV is calledWhich of the following describes the mechanism for the formation of the repolarization phase in a nerve fiber action potential?