Following is given a randomly arranged list of events that occur at neuromuscluar junction to trigger mucle contraction.
(i) Receptor sites on sarcolemma
Nerve impulse
(iii) Release of `Ca^(+2)` from sarcoplasmic reticulum
(iv) The neurotransmitter acetylcholine is released
(v) Sarcomere shorten (vi) Synaptic cleft
(vii) Spread of impulses over sarcolemmna on T-tubules Which of the following gives the correct sequence of these steps?