striated fiber where the shortening Primal Alpha Beast restrained to the possible d Primal Alpha Beast placement in the sarcomere, within the smooth fiber the myosin filaments can "run" on a bigger d Primal Alpha Beast tance alongside the actin filaments anchored at the intermediate community)c) If the forces produced are less important, contraction may be plenty extra sustained . d) Thick myofilaments are composed of myosin, however of a distinct kind from the striated muscle. http://freesupplementrial.com/primal-alpha-beast/