External Potassium and the Membrane Potential of Single Muscle Fibres

Nature ◽  
1950 ◽  
Vol 165 (4186) ◽  
pp. 113-114 ◽  
Author(s):  
GILBERT LING ◽  
R. W. GERARD
Keyword(s):  
Membrane Potential ◽  
Muscle Fibres ◽  
Single Muscle ◽  
External Potassium

The Efflux of Sodium from Single Crab Muscle Fibres

1967 ◽  
Vol 47 (3) ◽  
pp. 709-721 ◽  
Author(s):  
E. E. Bittar ◽  
P. C. Caldweix ◽  
A. G. Lowe
Keyword(s):  
Normal Level ◽  
Sodium Pump ◽  
Muscle Fibres ◽  
Single Muscle ◽  
Sodium Efflux ◽  
Leg Muscles ◽  
A Value ◽  
External Potassium ◽  
Radioactive Sodium ◽  
Lactate And Pyruvate

The efflux of radioactive sodium injected into single muscle fibres from the leg muscles of Maia squinado (Herbst) has been studied. The efflux is reduced by the sodium-pump-inhibitor ouabain and by removal of the external potassium. An increase in external potassium leads to a transient increase in sodium efflux which is then followed by a decline to a value well below the normal level. Externally applied caffeine and injected calcium can, under certain conditions, cause a lowering of the sodium efflux which may be associated with contraction of the fibre. The injection of lactate and pyruvate did not affect the efflux. The results are discussed in terms of the possible effects of the structure of the fibre on the efflux.

scholarly journals Twitch and Tetanic Tension during Culture of Mature Xenopus laevis Single Muscle Fibres

2001 ◽  
Vol 109 (5) ◽  
pp. 410-417 ◽  
Author(s):  
R.T. Jaspers ◽  
H.M. Feenstra ◽  
M.B.E. Lee-de Groot ◽  
P.A. Huijing ◽  
W.J. van der Laarse
Keyword(s):  
Xenopus Laevis ◽  
Muscle Fibres ◽  
Single Muscle ◽  
Tetanic Tension
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