In muscle contraction, the breaking of the cross-bridge between actin and myosin is caused by ____.
A) hydrolysis of ATP into ADP and Pi
B) formation of ATP from ADP and Pi
C) release of Pi from the myosin head
D) binding of a new ATP to the myosin head
E) return of myosin to a high-energy state

Question

Quizplus · Accepted Answer

The breaking of the cross-bridge between actin and myosin during muscle contraction is caused by the binding of a new ATP molecule to the myosin head. This event triggers the release of the myosin head from the actin filament, allowing the muscle to relax or prepare for another contraction cycle.

In Muscle Contraction, the Breaking of the Cross-Bridge Between Actin