microscopic anatomy of skeletal muscle
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| sarcoplasmic reticulum | a reservoir of calcium ions; it has gated channels in its membranes that allow a flood of calcium ion into the cytosol where it activates muscle contraction.
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| A T tubule and its associated two terminal cisternae constitute a | triad
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| contractile proteins | Myosin and actin are called contractile proteins because they accomplish the shortening of the muscle fiber
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| regulatory proteins | Tropomyosin and troponin are called regulatory proteins because they act like a switch to determine when the fiber can contract or not contract
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| The action of these regulatory proteins depends on the availability of ___________, which bind to troponin. | calcium ions
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| Dystrophin | an enormous protein located between the sarcolemma and the outermost myofilaments; it links actin filaments to a peripheral protein on the inner face of the sarcolemma.
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| A band | Dark bands that consist of thick filaments lying side by side that partly overlap the thin filaments
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| H band | the lighter area is the A band contains thick filaments only
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| M line | dark band in center of an H band, where myosin bands connect
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| I band | light band consists of thin filaments only but isbisected by a dark narrow Z disc (Z line)
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| Z disc (Z line) | which provides anchorage for the thin filaments and elastic filaments.
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