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Squid giant axons were internally dialyzed with a medium free of metabolic substrates but containing 45Ca buffered with EGTA to concentrations of free Ca++ in the range 0.01-230 muM. At (Ca)i of 1.0 muM OR GREATER, Ca efflux was in the range of 1-3 pmol/cm2 s, was dependent on (Na)o and (Ca)o, and was sensitive to membrane potential. At lower (Ca)i, the sensitivity of Ca efflux to membrane potential was greater. Hyperpolarization of the membrane increased, and depolarization decreased Ca efflux over the range of potentials studied (-20 to -100 mV). The maximum sensitivity of Ca efflux to membrane potential was of the order of an e-fold increase in Ca efflux for a 25-mV increase in Em; this sensitivity of Ca efflux to membrane potential was lost if (Na)o was removed and was greatly reduced when (Ca)i was increased to 230 muM.

Sensitivity of calcium efflux from squid axons to changes in membrane potential.