Question

how is the energy released in a muscle cell

Answer 1

Energy Supply for Muscle Contraction. Energy for the release and movement of the myosin head along the actin filament comes from adenosine triphosphate (ATP). ... Eventually, enzymes stored in cells are released and break down the actomyosin complex, and the muscles become "soft" again

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Answer 2

$\huge\pink{Heya!!!\:Mate}$

The source of energy that is used to power the movement of contraction in working muscles is adenosine triphosphate (ATP) – the body's biochemical way to store and transport energy............