Abstract
Isometric tension and intracellular calcium movements detected using the calcium sensitive photoprotein aequorin have been studied on single striated fibres. The decrease of tension and light response upon deprivation of external calcium would support the notion that calcium ions are involved in the transmission of the electrical potential change from the tubular system to the sarcoplasmic reticulum, by occupying sites on the external (extracellular) surface of tubular system in direct correspondence with the terminal sacs of the sarcoplasmic reticulum.
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