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V-51 (3) EM of skeletal muscle. The specimen was taken from frog sartorius muscle. Using your text and atlas firgures, identify the following structures: Z-line, I-band, A-band, H-zone, sarcomere, tubular system (TS), triad, sarcoplasmic reticulum (SR), and terminal cisternae of SR. The location of the triad (diad) is different in mammalian skeletal muscles, and it is situated in the overlap area of thick and thin filaments.