A) magnesium
B) chloride
C) calcium
D) iron
Correct Answer: C
Solution :
Transmission of nerve impules from one neuron to another and at neuromuscular junction is required by an organic compound acetylcholine and \[C{{a}^{2+}}\] respectively. Most synapsis across these is by means of some chemical mediator. As action potential of depolarisation reaches the presynaptic membrane its voltage gated \[C{{a}^{2+}}\] channels open, \[C{{a}^{2+}}\] is some 10,000 times more concentrated in synaptic fluid. It therefore, reaches into presynaptic knob. \[C{{a}^{2+}}\] induce the synaptic vesicle to reach the presynaptic membrane fuse with it and release the neurotransmitter into synaptic cleft through exocytosis,
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