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Which of the following actions is most likely to terminate an ongoing contraction of a skeletal muscle fibre?

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Release of neurotransmitter at the neuromuscular junction

Increase in Ca²⁺ concentration in sarcoplasm

Influx of Ca²⁺ into the axon terminal at the neuromuscular junction

Removal of Ca²⁺ from sarcoplasm

answer is D.

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Detailed Solution

When Ca⁺⁺ ions removed from sarcoplasm, active sites on actin filaments are masked. This causes the return of ‘Z’ lines back to their original position (muscle relaxation).

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