Abstract
Psychogenic stress in rabbits induced by fixation of the animals to a frame was accompanied by an increase in contractile activity of the duodenum. Against the background of blockade of muscarinic and nicotinic cholinergic receptors and β(1)/β(2)-adrenoceptors this increase was observed in postpyloric portion, but not in the distal third of the duodenum. The increase in contractile activity was determined by the direct effect of the hormonal stress factor on smooth muscles in the first case and by the influence of circulating catecholamines on excitatory β-adrenoceptors of cholinergic neurons of the enteral nervous system in the second.
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