In skeletal muscle fibers each myosin head binds to a?

In skeletal muscle fibers, each myosin head binds to an actin filament during the contraction process. This interaction occurs when calcium ions are released, allowing myosin to attach to specific binding sites on actin. The binding triggers a conformational change in the myosin head, leading to the power stroke that pulls the actin filaments closer together, resulting in muscle contraction. This cycle continues as long as calcium and ATP are present.