What happens during the power stroke of the contraction cycle? A) myosin head attaches to actin B) myosin head detaches from actin C) myosin head hydrolyzes ATP to ADP D) myosin head pivots from 90^o angle to 45^o angle

Question

Quizplus · Accepted Answer

During the power stroke of the contraction cycle, the myosin head pivots from a 90 degree angle to a 45 degree angle, pulling the actin filament towards the center of the sarcomere. This movement is powered by the energy released from the hydrolysis of ATP to ADP by the myosin head. The myosin head remains attached to the actin filament during the power stroke until the ADP is released and a new molecule of ATP binds to the myosin head, causing it to detach and return to its original position.

What Happens During the Power Stroke of the Contraction Cycle