Effects of extracellular calcium on calcium movements of excitation-contraction coupling in frog skeletal muscle fibres.


1. The effect of low extracellular free calcium ion concentration ([Ca2+]o) on the transient changes in cytoplasmic [Ca2+] associated with membrane depolarization (Ca2+ transients) was studied on single cut skeletal muscle fibres of the frog, voltage clamped in a double-Vaseline-gap chamber. The Ca2+ transients were monitored with the dye Antipyrylazo III… (More)


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