SUMMARY1. The Ca2+ influx occurring across the post-synaptic membrane during transmitter action was studied at the frog neuromuscular junction, using the Ca sensitive dye arsenazo III to monitor the resulting changes in free myoplasmic Ca2t concentration.
Intracellular injection of the calcium indicator dye arsenazo III was used to measure the calcium transients occurring during depolarization of frog skeletal muscle fibres. A quantitative estimate of the rise in intracellular free calcium during a twitch was made, and the relation between membrane potential and calcium release was examined. The results also indicate that calcium in the bathing solution plays no important part in the generation of calcium transients during single twitches.
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