[Peripheral mechanisms of the responses of small intestine capacitance vessels to noradrenaline].
Noradrenalin was shown to elicit either constrictory or dilatory responses depending on the initial level of venous pressure (10-15 mm Hg or 0 and 25 mm Hg) in the capacitance vessels of the cat small intestine. Blockade of beta-adrenoreceptors with propranolol has no effect on the capacitance vessels responses. Blockade of alpha-adrenoreceptors with dihydroergotoxin makes noradrenaline to elicit dilatory responses only, their magnitude depending on the initial level of venous pressure: more obvious responses at 10-15 mm Hg, less obvious those - at 0 and 25 mm Hg.
D000818:Animals; D001808:Blood Vessels / Q000187:drug effects*; D002415:Cats; D004088:Dihydroergotoxine / Q000494:pharmacology; D004347:Drug Interactions; D007421:Intestine, Small / Q000098:blood supply*; D009638:Norepinephrine / Q000494:pharmacology*; D011433:Propranolol / Q000494:pharmacology; D014690:Venous Pressure
D004088:Dihydroergotoxine; D011433:Propranolol; D009638:Norepinephrine
Perifericheskie mekhanizmy reaktsiĭ emkostnykh sosudov tonkogo kishechnika na noradrenalin.