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The Intracellular Site of Calcium Activation of Contraction in Frog Skeletal Muscle
Open accessAbstract
Radioautography has been used to localize 45Ca in isotopically labeled frog skeletal muscle fibers which had been quickly frozen during a maintained tetanus, a declining tetanus, or during the period immediately following a tetanus or a contracture. During a tetanus almost all of the myofibrillar 45Ca is localized in the region of the sarcomere occupied by the thin filaments. The amount varies with the tension being developed by the muscle. The movement of calcium within the reticulum from the tubular portion to the terminal cisternae during the posttetanic period has a half-time of about 9 sec at room temperature and a Q10 of about 1.7. Repolarization is not necessary for this movement. Evidence is given to support the notion that most calcium efflux from the cell occurs from the terminal cisternae into the transverse tubules.
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Cited by
SCHNEIDER, M. F., & CHANDLER, W. K. (1973) · Nature · doi:10.1038/242244a0 · Cited by 992
Motor Units: Anatomy, Physiology, and Functional Organization
Burke, R. E. (1981) · Comprehensive Physiology · doi:10.1002/cphy.cp010210 · Cited by 782
Calcium release from the sarcoplasmic reticulum.
Fabiato, A., & Fabiato, F. (1977) · Circulation Research · doi:10.1161/01.res.40.2.119 · Cited by 420
The effect of activation history on tension production by individual muscle units
Burke, R. E., Rudomin, P., & Zajac, F. E. (1976) · Brain Research · doi:10.1016/0006-8993(76)90031-7 · Cited by 406
Akster, H. (1981) · Cell and Tissue Research · doi:10.1007/bf00210022 · Cited by 33
Metadata
- Authors
- Winegrad, S.
- Venue
- The Journal of General Physiology
- Publisher
- Rockefeller University Press
- Published
- 1970-01-01
- Volume
- 55
- Issue
- 1
- Pages
- 77-88
- ISSN
- 0022-1295 (ISSN-L)
- 1540-7748
- OpenAlex
- W2005153376
- Cited by
- 200
- References
- 0
- FWCI
- 6.21
- Type
- journal article
- Language
- en
- Open access
- bronze
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