Sir why in this question answer is 4th option
In answer it is expressed that Na channels will not open but sir in video you told that there is influx of Na means depolarisation at every point in neuron but at base of neuron which is axon it is very special there is influx of Na alongwith Ca and ca is very important 2nd messenger so , ca is allowing Na to enter inside
In the question it is referred that Ca channel will be blocked so Na channel will not open. The given answer is correct.
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