A) \[C{{a}^{2+}}\] ions
B) \[M{{g}^{2+}}\] ions
C) Both (a) and (b)
D) \[F{{e}^{2+}}\] ions
Correct Answer: A
Solution :
\[C{{a}^{2+}}\] is essential of muscle contraction, neutro-muscular functions and nerve impulse transmission. During nerve impulse transmission, as an impulse arrives at a synaptic knob, calcium ions \[(C{{a}^{2+}})\] diffuse into the knobs from surrounding tissue fluid. \[C{{a}^{2+}}\] trigger a process in which numerous synaptic vesicles fuse with the membrane of the knob and the areas of fusion break down; releasing the contents of vesicles into the fluid of synaptic clefts.
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