Figure 3. ICa suppression in low extracellular [Na+] is concentration dependent at [Na+]o above 100 mM.
A) Concentration-dependence of ICa suppression in various extracellular Na+ concentrations ranging from 145 to 10 mM (N=4–11, p<0.01 at all points). B–D) Time course of ICa suppression in extracellular solutions containing 50, 100, 120 mM NaCl respectively. Extracellular Na+ was replaced by equivalent amount of Cs+.