Isotonic contraction of skinned muscle fibers on a slow time base: effects of ionic strength and calcium.
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چکیده
منابع مشابه
Isotonic contraction of skinned muscle fibers on a slow time base: effects of ionic strength and calcium
The force development by calcium-activated skinned frog skeletal muscle fibers and the motion on a slow time base after a quick decrease in load were studied at 0-1 degrees C as a function of the ionic strength and the degree of activation. The ionic strength was varied between 50 and 190 mM by adding appropriate concentrations of KCl to the bathing solution. Under these conditions, the fibers ...
متن کاملContraction transients of skinned muscle fibers: effects of calcium and ionic strength
Calcium and ionic strength are both known to modify the force developed by skinned frog muscle fibers. To determine how these parameters affect the cross-bridge contraction mechanism, the isotonic velocity transients following step changes in load were studied in solutions in which calcium concentration and ionic strength were varied. Analysis of the motion showed that calcium has no effect on ...
متن کاملIonic Strength and the Contraction Kinetics of Skinned Muscle Fibers
The influence of KCl concentration on the contraction kinetics of skinned frog muscle fibers at 5-7 degrees C was studied at various calcium levels. The magnitude of the calcium-activated force decreased continuously as the KCl concentration of the bathing solution was increased from 0 to 280 mM. The shortening velocity at a given relative load was unaffected by the level of calcium activation ...
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Tension in Skinned Frog Muscle Fibers in Solutions of Varying Ionic Strength and Neutral Salt Composition
The maximal calcium-activated isometric tension produced by a skinned frog single muscle fiber falls off as the ionic strength of the solution bathing this fiber is elevated declining to zero near 0.5 M as the ionic strength is varied using KCl. When other neutral salts are used, the tension always declines at high ionic strength, but there is some difference between the various neutral salts u...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1981
ISSN: 0022-1295,1540-7748
DOI: 10.1085/jgp.78.3.233