Figure 8: Effect of ovariectomy on acetylcholine-induced endothelium-dependent relaxation (a) and sodium nitroprusside-induced endothelium-independent relaxation on isolated aortic ring preparation (b) after 1, 2, and 3 months. Responses are expressed as percentage of maximum contraction induced by phenylephrine (3 × 10−6 M). Data are expressed as mean ± standard error of mean. (*) P < 0.05 versus sham
