NEET Biology question
Arrange the following steps of muscle contraction in the sequence of events occurring first I. Receptor sites on sarcolemma II. Nerve impulse III. Release of Ca2+ IV. Acetylcholine release V. Shortening of sarcomere VI. Synaptic cleft VII. Spread of impulse over sarcolemma on T-tubule The correct option is
Answer: (A)
Solution
Contraction begins with a nerve impulse (II) that releases acetylcholine (IV) into the synaptic cleft (VI), which binds receptor sites on the sarcolemma (I), generating an impulse
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