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 $Ca^{+2}$ 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) $(ii) \to (iv) \to (vi) \to (i) \to (vii) \to (iii) \to (v)$