Zoology-(general)
NEET Zoology (general) MCQ Question
Type: MCQ-diagram based-Hard-Class 11
Consider a diagram illustrating a nerve impulse transmission along an axon. If the membrane at a specific site becomes depolarized, what ion movement is primarily responsible for this change in polarity?
A
Influx of Na+ ions
B
Efflux of K+ ions
C
Influx of Cl- ions
D
Efflux of Na+ ions
Correct Answer
Option A
Detailed Explanation
Depolarization occurs when Na+ ions enter the neuron, reversing the polarity of the membrane at that site as described in the NCERT context.
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