Question

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

• A. $(ii)\to (iv)\to (i)\to (vi)\to (vii)\to (iii)\to (v)$
• B. $(ii)\to (iv)\to (vi)\to (i)\to (vii)\to (iii)\to (v)$
• C. $(i)\to (ii)\to (iii)\to (iv)\to (v)\to (vi)\to (vii)$
• D. $(vii)\to (vi)\to (v)\to (iv)\to (iii)\to (ii)\to (i)$

Answer 1

Answer: (B)

Correct answer is (b) $(ii)\to (iv)\to (vi)\to (i)\to (vii)\to (iii)\to (v)$