Muscular System Complete Lesson Notes (Digital) IncludesOrganization of muscle tissue from cell to whole muscle to groups of muscles, including connective tissue coverings. The structure of a skeletal muscle fiber including the transverse (T) tubules, sarcoplasmic reticulum, and myofibrils.The organization of a myofibril and sarcomere, including thick and thin filaments, light and dark bands, Z lines, and H zonesSliding filament theory of muscle contraction.The neuromuscular junction and the ord