NEET Zoology (general) MCQ Question
Which of the following combinations correctly describe the processes involved in the generation of an action potential in neurons?
Depolarization occurs when the membrane becomes permeable to Na+, leading to a reversal of polarity.
The resting potential is established by the influx of K+ ions into the neuron.
A stimulus must occur at the axon hillock for an action potential to be generated.
The influx of Na+ ions during depolarization results in the outer membrane becoming positively charged.
Correct Answer
Detailed Explanation
Option A correctly describes that depolarization occurs due to Na+ influx, reversing the membrane polarity. Option B is incorrect as the resting potential is primarily maintained by K+ efflux. Option C is misleading because depolarization can occur at various points along the axon, not just the axon hillock. Option D is incorrect since the outer membrane becomes negatively charged during depolarization.
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