Answer
First, the calcium ion will enter the axon terminal. Then, it will cause the synaptic vesicles to release their neurotransmitter. This neurotransmitter will diffuse across the synaptic cleft and open the sodium ion channel of sarcolemma. This will help to sustain the action potential of the nerve impulse. This action potential will reach sarcolemma, which will release the calcium ions. This release of calcium ions will initiate the sliding-filament theory for muscle contraction, and the muscle contraction will finally occur.
Work Step by Step
Same as above.
