BIOL 319 1st EditionLecture 9I. Muscle Fibers/Cellsa. Stacks of Parallel Myofibrilsb. Striations from Protein Alignmentsc. Dark A bandd. Light I bandII. Parts of a Muscle Fibera. A bandi. H Zone with M lineb. I bandi. Bisected by Z discIII. Sarcomere Structurea. Functional protein unit of a muscleb. Bordered by 2 Z discs on either sidec. 3 protein filaments within: thick, thin, elastic (titin)IV. Bands and Linesa. Z discs connect sarcomere togetherb. M line binds thick filamentsc. I band- only thin filamentd. H zone- only thick filamentV. Myofilamenta. Thickb. Bundles of Myosinc. Tail- 2 interwoven chainsd. Head- 2 globulese. 300 myosins together VI. Actin Filament a. Thinb. Helical Polymersc. Double Helix of actind. Tropomyosine. Troponin complexf. C subunit: calciumVII. Sarcoplasmic Reticuluma. Internal networkingb. Terminal CisternsVIII. T Tubulesa. Sandwiched by terminal cisternsb. Transverse extension of sarcolemmaThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.c. Triad at A-I band junctionIX. Sliding Filament Hypothesisa. Skeletal Muscle Fiber contractionb. Band Width changingc. Change in Filament overlapd. Thick filaments stationary, thin filaments sliding e. “Electrical excitation” to perform