Ang II-induced relaxations of isolated bovine adrenal cortical arteries. A. Effect of the NO synthase inhibitor, L-NA (30 μmol/L) and the AT1 receptor antagonist, losartan (1 μmol/L). Relaxations were performed under control conditions or after treatment with losartan or L-NA. B. Effect of L-NA on losartan-enhanced Ang II relaxations. Relaxations were performed on losartan-treated arteries before and after treatment with L-NA. C. Effect of the Ang (1-7) receptor antagonist, Ala7-Ang (1-7) (1 μmol/L) on losartan-enhanced Ang II relaxations. Relaxations were performed on losartan-treated arteries before and after treatment with Ala7-Ang (1-7). D. Effect of the AT2 receptor antagonist, PD123319 (1 and 10 μmol/L) on losartan-enhanced Ang II relaxations. Relaxations were performed on losartan-treated arteries before and after treatment with PD123319. n = 5–34, * p< 0.05 vs. control or losartan.