Radiocalcium Release by Stimulated and Potassium-Treated Sartorius Muscles of the Frog
Open Access
- 1 January 1960
- journal article
- research article
- Published by Rockefeller University Press in The Journal of general physiology
- Vol. 43 (3) , 481-493
- https://doi.org/10.1085/jgp.43.3.481
Abstract
Stimulation of frog (Rana pipiens) sartorius muscle accelerates release of Ca45, but only during the period of stimulation. No appreciable difference is obtained in the calcium released per impulse whether stimulation is at a rate of 20/sec. or 0.5/sec. However, prior stimulation may appreciably increase the loss per impulse. In unfatigued muscles, the minimum amount of calcium liberated during an isotonic twitch is estimated to be about that previously calculated to enter, viz. 0.2 µµmole/cm2.Keywords
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