Question

Which of the following is important for muscle contraction and nerve impulse transmission?

• A. $C{a}^{2+}$ ions
• B. $M{g}^{2+}$ ions
• C. Both (a) and (b)
• D. $F{e}^{2+}$ ions

Answer 1

Answer: (A)

$C{a}^{2+}$ is essential of muscle contraction, neutron-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.