the immature kidney has a blunted natriuretic response to saline loading . to localize the high fractional na reabsorption in the developing nephron , we determined na delivery to the early distal tubule ( edt ) and the fraction of filtered na remaining in the tubular fluid [ ( tf/p ) na/in ] in the edt and late distal tubule ( ldt ) in 24- and 40-day-old hydropenic ( hp ) and volume-expanded ( ve ) rats .
C0022646
kidney
C0027713
nephron