The decremental propagation of the action potential and loss of mechanical response in frog sartorius muscle in the absence of calcium

1963 ◽  
Vol 19 (1) ◽  
pp. 40-40
Author(s):  
K. A. P. Edman ◽  
D. W. Grieve
Keyword(s):  
Action Potential ◽  
Mechanical Response ◽  
Sartorius Muscle ◽  
Frog Sartorius Muscle ◽  
Frog Sartorius

The interactive effects of fatigue and pH on the ionic conductance of frog sartorius muscle fibers

1985 ◽  
Vol 63 (11) ◽  
pp. 1444-1453 ◽  
Author(s):  
J. M. Renaud ◽  
G. W. Mainwood
Keyword(s):  
Action Potential ◽  
Normal Values ◽  
Muscle Fibers ◽  
Membrane Conductance ◽  
Interactive Effects ◽  
Resting Potential ◽  
Sartorius Muscle ◽  
Ionic Conductance ◽  
Frog Sartorius Muscle ◽  
Frog Sartorius

The effects of fatigue on the membrane conductance of frog sartorius muscle at the resting potential and during an action potential were studied. When muscles were exposed to an extracellular pH of 8.0 the membrane conductance at the resting potential increased during fatigue by about 20% and returned to prefatigue level in about 20 min. The membrane conductance of muscle fibers exposed to pH 6.4 was about three times less than that of pH 8.0 and decreased further during fatigue. Furthermore, the recovery of a normal membrane conductance was slow at pH 6.4. Both the inward, depolarizing and the outward, repolarizing currents during the action potential are reduced in fatigue. In each case the effect is greater at pH 6.4 than at 8.0 and recovery towards normal values is slower at pH 6.4. It is concluded that the ionic conductance of the sareolemmal membrane at the resting potential and during an action potential are modified by fatigue and that these changes are modulated by pHo.

Constancy of Axial Spacings in Frog Sartorius Muscle during Contraction

Nature ◽  
1965 ◽  
Vol 206 (4991) ◽  
pp. 1358-1358 ◽  
Author(s):  
H. E. HUXLEY ◽  
W. BROWN ◽  
K. C. HOLMES
Keyword(s):  
Sartorius Muscle ◽  
Frog Sartorius Muscle ◽  
Frog Sartorius
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