Time-course of effects of i.c.v. injections of either aCSF (2µL, n = 8) or 5-HT (10 µg in 2 µL, n = 8) on mean arterial blood pressures (MAP), heart rates (HR), hindquarter (HQF), renal (RF) and mesenteric (MF) blood flows, and hindquarter (HQR), renal (RR) and mesenteric (MR) vascular resistances in conscious freely-moving rats. Each value is the mean ± SEM of the percentage changes in these parameters. *P < 0.05, significant response.