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responsible for muscle contraction/ anchored in inner surface of sarcolemma outer surface of sarcolemma attached to collagen fibers of tendon
sarcoplasmic reticulum (SR)
similar to smooth ER of other cells, tubular network , surr each myofibril
forms core to thick filaments @ Z line functions to restoration of fiber length after contraction
Ca+ expos to active sites, formation of cross-bridges, pivoting of myosin heads, etachment of cross-bridges, reactivation of myosin
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