Answer :
When, Atp has just been hydrolyzed to adp and phosphate, then the sarcomere is at Recovery stroke stage of the cross-bridge cycle.
Cross-bridge cycle:
In 1957, Andrew Huxley quantitatively developed the cross-bridge hypothesis for the first time. Cross-bridge cycling demonstrates muscle shortening caused by the movement of contractile proteins. The cross-bridge muscle contraction cycle is recognised in all muscle types, including cardiac, smooth, and skeletal muscles. This means that all muscle types contract by cycling across bridges.
A cross-bridge between actin and myosin causes this phase to occur. The phosphate ion from ATP provides the potential energy that the myosin is loaded with. The entry of calcium ions initiates this process, which serves to make actin binding sites visible. Working stroke/power step: The organic phosphate's energy is released, strengthening the connection between myosin and actin.
So, the sarcomere is at the Recovery stroke stage of the cross-bridge cycle.
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