Zoology - Locomotion and Movement Question with Solution | TestHub

${\mathrm{Ca}}^{2+}$ 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 $\left({\mathrm{Ca}}^{2+}\right)$ diffuse into the knobs from surrounding tissue fluid. ${\mathrm{Ca}}^{2+}$ 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.