Different Densities of Na-Ca Exchange Current in T-Tubular and Surface Membranes and Their Impact on Cellular Activity in a Model of Rat Ventricular Cardiomyocyte

Table 1

Fractions of ion transporters in the t-tubular membrane of rat ventricular cardiomyocytes as estimated from experimental measurements of ionic currents and membrane capacitances in intact and detubulated cells. The individual fractions relate to ion transporters mediating: fast Na current (), L-type Ca current (), transient outward K current (), steady-state outward K current (), inward rectifying K current (), hyperpolarization-activated current (), background currents (, , ), Na-Ca exchange current (), Na-K pump current (), and Ca pump current (). Adopted from supplement to [19].

	0.38
	0.8
	0.46
	0.86
	0.47
	0.49
	0.49
	0.49
	0.49
f	0.78
	0.64
	0.95