scholarly journals Existence of a sodium-induced calcium release mechanism of frog skeletal muscle fibres.

1982 ◽  
Vol 333 (1) ◽  
pp. 463-480 ◽  
Author(s):  
D Potreau ◽  
G Raymond
Keyword(s):  
Skeletal Muscle ◽  
Calcium Release ◽  
Release Mechanism ◽  
Muscle Fibres ◽  
Frog Skeletal Muscle ◽  
Skeletal Muscle Fibres

Minimal latency of calcium release in frog twitch muscle fibres

1986 ◽  
Vol 229 (1254) ◽  
pp. 39-46 ◽  
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Calcium Release ◽  
Arsenazo Iii ◽  
Muscle Fibres ◽  
Coupling Mechanism ◽  
Frog Skeletal Muscle ◽  
Intracellular Release ◽  
Skeletal Muscle Fibres

Intracellular release of calcium in frog skeletal muscle fibres was monitored by the use of arsenazo III, in response to voltage clamped depolarizing pulses. A latency of a few milliseconds was evident between the onset of depolarization and the first detectable rise in the arsenazocalcium signal, and this decreased logarithmically as the depolarization was increased. The minimal latency with strong depolarization (to +20 to +100 mV) was about 2 ms at 5 °C. This delay appears to be sufficiently long to be compatible with a chemically mediated coupling mechanism between depolarization and calcium release from the sarcoplasmic reticulum.

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