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This Concept Map, created with IHMC CmapTools, has information related to: The Muscle System Group 6, fascicles individual fascicle covered by perimysium tissue, sarcomeres composed of myofilaments, fascicle covered by perimysium tissue contains muscle fibers, muscle fibers contains myofibrils, epimysium tissue surrounds (outside) covers several fascicles, contraction form sliding filament model, myofilaments type thin (actin), depolarization down the sarcolemma to the T tubules triggers release of Ca from the SR into the cell interior, thick (myosin) participate in sliding filament model, myofilaments type thick (myosin), myofibrils composed of sarcomeres, smooth, arranged in sheets involuntary type single-unit electrically coupled fibers contracts synchronously & spontanteously, Muscles type cardiac, striated involuntary, release of Ca from the SR into the cell interior binds to troponin, acetylcholine (ACh) opens the Na/K channels, contraction triggered by action potential, troponin allows for cross bridge formation between actin & myosin, thin (actin) participate in sliding filament model, sliding filament model function actin filaments are pulled toward sarcomere centers by cross bridge (myosin head) activity, Muscles type skeletal, striated voluntary