Potassium fluxes across the blood brain barrier of the cockroach, Periplaneta americana

Potassium fluxes across the blood-brain barrier of the cockroach Periplaneta americana were measured using the scanning ion-selective microelectrode technique. In salines containing 15 mM or 25 mMK(+), an efflux of K(+) from the ganglia of isolated nerve cords was counterbalanced by an influx across the connectives. Metabolic inhibition with CN(-) resulted in an increase in K(+) efflux across both the ganglia and the connectives. Depletion of …