Fig. 5From: Membrane potential modulation of ionomycin-stimulated Ca2+ entry via Ca2+/H+ exchange and SOC in rat submandibular acinar cellsEffects of a high [Ca2+]o (20 mM). Experiments were carried out using 4 μM TG in a HCO3 −-free solution. In these experiments, the [Ca2+]o used was 20 mM to increase the driving force for Ca2+ entry. a An increase in [Ca2+]o (20 mM) enhanced the [Ca2+]i increase following the reintroduction of Ca2+ at 151 mM [K+]o. b Effects of [K+]o on the rate of F340/F380 increase (Ca2+ influx). With increasing [K+]o, the rates of [Ca2+]i increase linearly decreased, and the intercept of the x axis was 188 mMBack to article page