Release of which of the following helps in relaxation of a skeletal muscle fibre ?

Calcium

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Acetylcholine

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Acetylcholinesterase

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Dopamine

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Solution

The correct option is A Calcium
A. Calcium
EXPLANATION: Release of calcium helps in relaxation of a skeletal muscle fibre. The muscle fiber will repolarize , which closes the gates in the sarcoplasmic reticulum where $C a^{+ +}$ was being released. Then calcium is pumped back into the sarcoplasmic reticulum, which is the link between actin and myosin.
So, the correct answer is option A.

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