Fig. 1

Basal levels of ovarian venous plasma flow rate (a), estradiol concentration in ovarian venous plasma (b), the secretion rate of estradiol from the ovary (c), and mean arterial pressure (d), before (white columns) and after (hatched columns) the administration of prazosin (P) (n = 6) or yohimbine (Y) (n = 4). *p < 0.05 and **p < 0.01 indicate values that were significantly different to values obtained before the administration of each alpha-adrenoceptor antagonist, as determined by the paired t test. Each column and vertical bar show mean ± SEM