Arrange the following steps of muscle contraction in the sequence of events occurring first.
(I) Action potential in the sarcolemma
(II) Nerve impulse
(III) Release of 
from sarcoplasmic reticulum reaches to synaptic cleft
(IV) Acetylcholine release
(V) Shortening of sarcomere
(VI) Spread of impulse over muscle fibre
The correct option is
Text Solution
Verified by ExpertsA
Nerve impulse causes
↓
Acetylcholine release which reaches to synaptic cleft
↓
Sarcolemma have receptor which senses the acetylcholine
↓
Spread of the impulse throughout the muscle fibre
↓
Release of calcium from sarcoplasmic reticulum
↓
Breakdown of troponin
↓
Thin and thick filaments slides on each other and contraction starts, i.e., shortening of sarcomeres.
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