ACTIN, ALI, ANATOMY, ARTWORK, BACKGROUND, BAND, CONTRACTILE, CONTRACTION, damouh, DARKER, DIAGRAM, FIBER, FIBRE, FIBRIL, FILAMENT, GRAPHIC, H, ILLUSTRATION, LIGHTER, LINE, MECHANISM, MUSCLE, MUSCLES, MUSCULAR, MYOFIBRIL, MYOFILAMENTS, MYOSIN, NEUROMUSCULAR, NO-ONE, NOBODY, SARCOLEMMA, SARCOMERE, STRIATED, STRIATION, STRUCTURE, SYSTEM, THICK, THIN, WHITE, Z, ZONE,