Experiments performed in anesthetized dogs have shown that occlusion of the coeliac and mesenteric arteries may determine minor increases of systemic blood pressure, obviously of hemodynamic nature and not induced by baroreceptive vasomotor reflexes. Increase of pressure into the mesenteric arterial circulation does not decrease the systemic blood pressure. The aortic and carotid sinus baroreceptors are the major means of the reflex blood pressure homeostasis. Evidence for the existence of specific chemoreceptors in the abdominal vascular area could not be obtained.