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a
Contraction of muscle fibre takes place by the sliding of thin filaments over the thick filaments.
b
Muscle contraction is initiated by a signal sent by the central nervous system via a sensory neuron.
c
Calcium ions are released by the sarcoplasmic reticulum into the sarcoplasm.
d
A neural signal reaching the neuro-muscular junction releases acetylcholine.
answer is B.
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