2.

Effect of propranolol (2 mg/kg i.v.), prazosin (0.3 mg/kg i.v.) and norep-inephrine (3 mg/kg i.p.) exposure on cardiac antioxidant cellular systems. Values are presented as the mean (S.D.) of nine rats. PP = treated with propranolol and prazosin, NE = treated with norepinephrine, NEPP = treated with norepinephrine, propranolol and prazosin.

A= p < 0.05 compared with control group B= p < 0.01 compared with control group C= p < 0.001 compared with control group D= p < 0.05 compared with PP group E= p < 0.01 compared with PP group F= p < 0.001 compared with PP group G= p < 0.05 compared with NE group H= p < 0.01 compared with NE group