Which of the following happens during a cross-bridge cycle in skeletal muscle

Question

Quizplus · Accepted Answer

During a cross-bridge cycle, ATP is hydrolyzed into ADP and phosphate, providing energy to energize the myosin cross bridge. This energized cross bridge then binds to actin, forming a strong actin-myosin linkage and facilitating a power stroke that results in the movement of the thin filament. Mg2+ is not involved in the breaking of the linkage between actin and the myosin cross bridge. The direction of the power stroke is not always toward the periphery of the thick filament, as it depends on the orientation and arrangement of the myosin and actin filaments. Binding between myosin and troponin does not occur during the cross-bridge cycle, as troponin is part of the regulatory complex that controls the interaction between actin and myosin.

Which of the Following Happens During a Cross-Bridge Cycle in Skeletal