Reactive oxygen species (ROS), such as superoxide anions and hydrogen peroxide, are reported to contribute to the dynamic regulation of contractility in various arterial preparations, however, the situation in pressurized, myogenically active resistance arteries is much less clear. In the present study, we have utilized established pharmacological inhibitors of NADPH oxidase activity to , Am J Physiol Heart Circ Physiol273: H1283–H1290, 1997. 21. Pfeffer MA, Pfeffer JM, Fishbein MC, Fletcher PJ, Spa- daro J, Kloner RA, and Braunwald E.Myocardial infarct size and ventricular function in rats. Circ Res44: 503–512, 1979. 22. Pfeffer MA and Braunwald E.Ventricular remodeling after myocardial infarction., The Harris Products Group is a world leader in metal working products used in the brazing, soldering, welding, cutting and gas distribution industries. The company was formed in 2006 with the merger of both Harris Calorifi c, Inc., a manufacturer of gas welding & cutting equipment, gas regulation & distribution systems and J.W. Harris Co., a manufacturer of brazing and soldering alloys., The Harris Products Group is a world leader in metal working products used in the brazing, soldering, welding, cutting and gas distribution industries. The company was formed in 2006 with the merger of both Harris Calorifi c, Inc., a manufacturer of gas welding & cutting equipment, gas regulation & distribution systems and J.W. Harris Co., a manufacturer of brazing and soldering alloys., Abstract Hepatosplanchnic and pulmonary vasculatures constitute synapomorphic, highly comparable networks integrated with the exter-nal environment. Given functionality related to obligatory requirements of “feeding and breathing, these organs are subject to, .