Respuesta :
Resetting: hydrolysis of atp provides energy, which causes the cross-bridge to move away from the H zone . adp and pi remain bound.
What is H zone?
The H zone is in the center of the A band where there is no overlap between the thick and the thin filaments. Therefore, in the H zone, the filaments consist only of the thick filament. The H zone becomes smaller as the muscle contracts and the sarcomere shortens. The center of the H zone is at the M line, which is also at the center of the sarcomere.
What is sarcomere?
Sarcomere, which is the basic unit of striated muscles, is a complex multicomponent biological system controllably transforming the chemical energy released upon ATP hydrolysis into mechanical work. Since the change in sarcomere length in a contracting muscle requires the presence of well-coordinated moving parts, many muscle proteins evolved to quickly adapt to the variable molecular environment and geometry. Consequently, protein regions that do not possess a rigid three-dimensional structure are expected to play important roles in the sarcomere functions.
Learn more about sarcomere
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