Muscles: Spanning from macro to nano Collection of myofibers Z disk Z disk Actin thin filament Myosin thick filament 000000 000 Myofiber (single cell 50 000 20099800000 Nucleus Plasma membrane Mlin Myofibril Sarcomere + A-band I band Z disk Actin: semiflexible polymer A band Myosin: molecular motor Titin: resting elasticityMuscles: Spanning from Macro to Nano molecular motor semiflexible polymer Actin: semiflexible polymer Myosin: molecular motor Titin: resting elasticity