question_answer

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)