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- W2030331337 abstract "According to the sliding filament model, changes in muscle length take place by movement of the two sets of filaments past each other without change in the individual filament lengths. Yet, when measurements of filament lengths are made in the electron microscope, it is found that they are not the same in excited muscle as in resting muscle. Both the A- and the /-filaments are shorter in muscles fixed while at rest than in those muscles which were fixed during an isometric contraction. The important point in interpreting these findings is whether or not length changes have occurred during preparation, and if so, whether the extent of these changes is the same in each case. An investigation has therefore been made of the changes produced under different conditions by the preparative procedures, to see whether or not there are genuine differences between the filament lengths in resting and excited muscles. It has also been possible as a result of this study to determine the value of the fine periodicity that is visible along the length of the A -filaments. Previous measurements of this periodicity have given values ranging from 250 to 400 A; and as it has not been clear how much shortening had occurred in these muscles during preparation, there has remained considerable uncertainty concerning both the actual magnitude of the periodicity, and any possible functional changes in it. The experiments have been carried out with frog and chicken muscles, in which the corresponding filaments have the same length." @default.
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- W2030331337 date "1964-10-27" @default.
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- W2030331337 title "Filament lengths in resting and excited muscles" @default.
- W2030331337 doi "https://doi.org/10.1098/rspb.1964.0056" @default.
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