Ruthenium red: differential effects on excitation and excitation-contraction coupling in frog skeletal muscle

1984 ◽  
Vol 5 (4) ◽  
pp. 399-410 ◽  
Author(s):  
Kenneth W. Snowdowne ◽  
John N. Howell
Keyword(s):  
Skeletal Muscle ◽  
Ruthenium Red ◽  
Frog Skeletal Muscle ◽  
Excitation Contraction Coupling ◽  
Differential Effects ◽  
Contraction Coupling

scholarly journals Effect of Ruthenium Red on Excitation-Contraction Coupling in Frog Skeletal Muscle

1980 ◽  
Vol 30 (1) ◽  
pp. 49-59 ◽  
Author(s):  
Toshiko SUZUKI ◽  
Kazuo OBARA ◽  
Torao NAGAI
Keyword(s):  
Skeletal Muscle ◽  
Ruthenium Red ◽  
Frog Skeletal Muscle ◽  
Excitation Contraction Coupling ◽  
Contraction Coupling

The Effect of Lanthanum on Excitation–Contraction Coupling in Frog Skeletal Muscle

1974 ◽  
Vol 52 (6) ◽  
pp. 1126-1135 ◽  
Author(s):  
D. J. Parry ◽  
A. Kover ◽  
G. B. Frank
Keyword(s):  
Skeletal Muscle ◽  
Action Potential ◽  
Muscle Membrane ◽  
Frog Skeletal Muscle ◽  
Tension Development ◽  
Excitation Contraction Coupling ◽  
Contraction Coupling ◽  
Reduced Rate ◽  
Caffeine Contractures

Exposure of frog toe muscles to 1 mM La3+ results in a decrease in amplitude and rate of tension development of potassium contractures and twitches. At this concentration La3+ also inhibits the uptake of calcium, both in the resting condition and during stimulation. Caffeine contractures are unaffected even after a 5-min pre-exposure to La3+. The depolarization induced by various concentrations of K+ is reduced by about 10 mV as is the amplitude of the action potential. The rate of rise of the action potential is reduced by about 40% after 1 min in La3+ Ringer. Neither the decreased amplitude nor the reduced rate of depolarization is considered to be sufficient to explain the inhibition of tension development. It is suggested that La3+ partially uncouples excitation from contraction by preventing the release of a trigger-Ca2+ fraction from some site on the muscle membrane. This fraction normally plays a role in excitation–contraction coupling, although some tension may still be developed in the absence of a trigger-Ca2+ influx.

Electromechanical Coupling II. The Effect of Perchlorate Upon Excitation-Contraction Coupling in Frog Skeletal Muscle Fibres

1982 ◽  
Vol 37 (7-8) ◽  
pp. 707-708
Author(s):  
Michael Gomolla ◽  
Gernot Gottschalk ◽  
Hans-Christoph Lüttgau
Keyword(s):  
Skeletal Muscle ◽  
Electromechanical Coupling ◽  
Muscle Fibres ◽  
Frog Skeletal Muscle ◽  
Large Shift ◽  
Excitation Contraction Coupling ◽  
Contraction Coupling ◽  
Inactivation Process ◽  
Skeletal Muscle Fibres ◽  
Kinetics Of

Abstract In single skeletal muscle Fibres perchlorate causes a large shift of the potential dependence of contraction activation to more negative potentials without a corresponding alteration in the kinetics of the inactivation process.

scholarly journals ROLE OF SUPERFICIALLY MEMBRANE-BOUND CALCIUM ON EXCITATION-CONTRACTION COUPLING IN FROG SKELETAL MUSCLE

1976 ◽  
Vol 26 (2) ◽  
pp. 117-126 ◽  
Author(s):  
Isao OOTA ◽  
Isao KOSAKA ◽  
Torao NAGAI
Keyword(s):  
Skeletal Muscle ◽  
Frog Skeletal Muscle ◽  
Excitation Contraction Coupling ◽  
Contraction Coupling ◽  
Membrane Bound
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