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sliding filament theory A proposed mechanism of muscle contraction in which the actin and myosin filaments of striated muscle slide over each other to shorten the length of the muscle fibres (see sarcomere). Myosin-binding sites on the actin filaments are exposed when calcium ions bind to troponin molecules in these filaments.
Now, the mechanism of the Sliding Filament Theory can be explained. Muscle contraction involves four major steps (shown in Figure 2): ATP binds to the myosin head. The cross bridge between the two fibers breaks as the myosin head dissociates from the actin myofilament.