The infusion of acetylcholine, bradykinin, angiotensin II, norepinephrine and serotonin into the lateral septal area produced a dose-dependent increase of arterial blood pressure and heart rate. A pattern of inhibition of these cardiovascular responses, produced by pretreatment of the lateral septal area with phentolamine, 6-hydroxydopamine, methysergide and 5,7-dihydroxytryptamine was disclosed. These results suggest that the effects of acetylcholine, bradykinin and partially of angiotensin II, depend on the release of norepinephrine and the actions of this neurotransmitter in turn depend on the integrity of the serotonergic system in the lateral septal area.
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