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 the threshold potential level of a cell is raised (shifted upwards), it will result in

Adecreased excitability of the cell

Bgreater amplitude of the action potential

Cactivation of more Na+ channels upon excitation

Ddecreased number of Na+ channels activated

Correct answer: A. decreased excitability of the cell

When the threshold potential level is raised, it becomes harder for the cell to reach the threshold required for an action potential. This leads to a decrease in the cell's excitability.

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.

Get free PDF

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?