Receptors, Peroxidase - metabolism, Sulfonamides - pharmacology, Inflammation - drug therapy, Trinitrobenzenesulfonic Acid - antagonists & inhibitors, Colitis - chemically induced, Regional Blood Flow - drug effects, Mesenteric Arteries - drug effects, Colitis - pathology, Oligopeptides - pharmacology, Endothelin - physiology, Antihypertensive Agents - pharm...