Final answer:
Myosin pulls on actin to produce a muscular contraction by binding to actin filaments and pulling them towards the center of the sarcomere.
Step-by-step explanation:
The thick filaments called myosin pull on the thin filament called actin to produce a muscular contraction. The myosin heads bind to the actin filaments and pull them towards the center of the sarcomere, causing the sarcomere to shorten and leading to muscle contraction. This process requires ATP to provide the energy for the contraction.