1.

Put the following phrases in proper order to describe what occurs at the 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 shorten. (vi) Synaptic cleft. (vii) Spread of impulses over sarcolemma on T-tubules.

A. (ii), (iv), (i), (vi), (vii), (iii), (v)
B. (ii), (iv), (vi), (i), (vii), (iii), (v)
C. (i), (ii), (iii), (iv), (v), (vi), (vii)
D. (vii), (vi), (v), (iv), (iii), (ii), (i)
Answer» C. (i), (ii), (iii), (iv), (v), (vi), (vii)


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