In order for a cross bridge to release from the thin filament after a power stroke is completed, It must hydrolyze ATP into ADP and Pi.
Myosin heads attach to actin and pull the actin inward, shortening the muscle. ATP supplies the necessary energy for this process. At a binding location on the globular actin protein, myosin binds to actin.
Another ATP-binding site on myosin is where enzymatic activity converts ATP to ADP, releasing energy and an inorganic phosphate molecule.
Actin and myosin can separate from one another when myosin releases actin in response to ATP binding. The newly attached ATP is then changed into ADP and inorganic phosphate, Pi, as a result.
ATPase is the name of the enzyme located at the myosin binding site. The myosin head's angle becomes "cocked" as a result of the energy generated during ATP hydrolysis.
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