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muscle fibers elongated cells in skeletal muscles striations light and dark stripes fascicles dense bundles voluntary muscle consciously controlled involuntary muscle cannot be controlled consciously skeletal muscle tissue many nuclei, striated, voluntary, elongated cells made into bundles smooth muscle tissue one nucleus, spindle shaped, interlaced to form sheets. involuntary cardiac muscle tissue striated, one nucleus, involuntary myofibrils threadlike structures that are bundled together to form skeletal muscle myosin thick filaments; protein; make up myofibrils actin thin filaments; protein; make up myofibrils Z line structure which the thin actin filaments are anchored to at their endpoints sarcomere region from one Z line to the next tendon tough fibrous cord of connective tissue that connects a muscle to the bone origin point where the muscle attaches to the stationary bone insertion where the muscle attaches to the moving bone flexor muscle that bends a joint extensor muscle that straightens a joint muscle fatigue physilogical inabillity of a muscle to contract; result of relative depletion of ATP oxygen debt temporary lack of oxygen availability belly biggest, thickest, whitest part Epimysium white sheeth covering the muscle