Following is given in a randomly arranged list of events that occur at neuromuscular junction to trigger muscle contraction
1) Receptor sites on sarcolemma
2) Nerve impulse
3) Release of Ca2+ from sarcoplasmic is reticulum
4) The neurotransmitter acetylcholine is released
5) Sarcomere shorten
6) Synaptic cleft
7) Spread of impulses over sarcolemma on T- tubules
Which of the following gives the correct sequence of these steps ?
2 --> 4 --> 1 --> 6 --> 7 --> 3 --> 5
2--> 4 --> 6 --> 1 --> 7 --> 3 --> 5
1 --> 2 --> 3 --> 4 --> 5 --> 6 --> 7
7 --> 6 --> 5 --> 4 --> 3 --> 2 --> 1
Therefore, Option 2) is the correct sequence.