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Ch11 Musclar tissue1

microscopic anatomy of skeletal muscle

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.
A T tubule and its associated two terminal cisternae constitute a triad
contractile proteins Myosin and actin are called contractile proteins because they accomplish the shortening of the muscle fiber
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
The action of these regulatory proteins depends on the availability of ___________, which bind to troponin. calcium ions
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.
A band Dark bands that consist of thick filaments lying side by side that partly overlap the thin filaments
H band the lighter area is the A band contains thick filaments only
M line dark band in center of an H band, where myosin bands connect
I band light band consists of thin filaments only but isbisected by a dark narrow Z disc (Z line)
Z disc (Z line) which provides anchorage for the thin filaments and elastic filaments.



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