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Put the following phrases in proper order to describe muscle contraction.
I. Shortening of sarcomere
II. Nerve impulse
III. Binding of calcium with troponin
IV. Formation of cross bridge
V. Release of acetylcholine
VI. Release of Ca²⁺ from sarcoplasmic reticulum
VII. Binding receptor sites on sarcolemma

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II, V, VII, VI, III, IV, I

II, V, IV, I, III, VI, VII

IV, I, III, VI, VII, V, II

II, IV, I, VI, VII, III, V

answer is B.

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Detailed Solution

Muscle contraction occurs in following steps.

Nerve impulse
Release of acetylcholine
Binding receptor sites on sarcolemma
Release of Ca²⁺ from sarcoplasmic reticulum
Binding of calcium with troponin
Formation of cross bridge
Shortening of sarcomere

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