In the presence of \( \mathrm{Ca}^{2+} \) channel blockers, which o...

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In the presence of \( \mathrm{Ca}^{2+} \) channel blockers, which of the following will be true?
\( \mathrm{P} \)
(1) Neurotransmitter is released but \( \mathrm{Na}^{+} \)channel of post-synaptic neuron will not open
W
(2) Neurotransmitter is not released but \( \mathrm{Na}^{+} \)channel of post-synaptic neuron will open up
(3) Neurotransmitter is released but \( \mathrm{K}^{+} \)channel of post-synaptic neuron open up
(4) Neither neurotransmitter is released nor the \( \mathrm{Na}^{+} \)channel of post-synaptic neuron open up
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