Fig. 4.
ACh-induced relaxation in pulmonary and mesenteric artery segments of normoxic, hypoxic, and MCT-treated rats. Pulmonary artery (A) and mesenteric artery segments (B) were precontracted with PHE (10−5 M), increasing concentrations of ACh were added and the percentage of relaxation of PHE contraction was measured. Data represent means ± S.E.M. (n = 6–16). *, measurements in hypoxic and MCT-treated rats are significantly different (p < 0.05) from corresponding measurements in normoxic rats.