Myosin heads pulling thin filaments produce the:

1. Movement of the thin filament happens at this step. 2. It is the working phase of the cycle. 3. This movement is called the power stroke, as movement of the thin filament occurs at this step. 4. So the answer is the power stroke. _Source: OpenStax 'Anatomy and Physiology 2e', Ch 10 'Muscle Tissue'_