Question

By which, myosin filament is joinedwith the z- line in case of skeletal muscle ?

Answer 1

When muscle contracts, the globular heads of the thick myosin filaments attach to the binding sites on the thin actin filaments and pull them toward each other. Since the thin filaments are anchored in the Z line, the sliding of the filaments causes each sarcomere - and thus the muscle fibers - to shorten.. hope it helps buddy :)