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Endothelial-dependent relaxation (EDR) in young and old control and PTH-treated rats. Dose responses of aortic rings to acetylcholine (ACh, A), maximal relaxation (Emax) to ACh (B), and area under the curve (AUC, C). *Difference from old control, P < 0.05. OC, old control (n = 11); OPTH, old animals treated with parathyroid hormone (PTH, n = 13); YC, young control (n = 14); YPTH, young animals treated with PTH (n = 14).
