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Responses of KCl (100 mmol/l)-precontracted rings of the rat thoracic aorta to acetylcholine (Ach, 10 µmol/l) before and after 20 min treatment by FeSO4 (0.1 mmol/l)/H2O2 (0.15 mmol/l). Each bar represents the mean ± SEM of 5–7 experiments. Significant differences (at least p<0.05) are: (*) from the initial KCl-elevated tension, (▴) between the Ach-reached relaxation levels, (▪) between the Ach-induced relaxation amplitudes.
