A, B, C. Effects of pretreatments with isotonic saline (0.9% NaCl), L-NAME (40 μg) or L-ARGININE (20 μg) in rats submitted to central injection of ANG-II (26 ng) or isotonic saline on plasma vasopressin (VP) (A), oxytocin (OT) (B), and atrial natriuretic peptide (ANP) (C) secretion. Seven to nine animals were used in each group. Differences among groups were determined by Two-Way ANOVA followed by the Newman-Keuls post test. Data are reported as means ± SEM. *P < 0.05 compared to the control group (Saline + Saline). •P < 0.05 compared to the Saline+L-ARGININE group. #P < 0.05 compared to the Saline+L-NAME group. +P < 0.05 compared to the Saline+ANG-II group.