Journal ArticleDOI
Circulatory effects of interruption and stimulation of cardiac vagal afferents.
B. ÖBerg,Saxon William White +1 more
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The influence of the rhythmic activity in cardiac vagal afferents on the circulation was analyzed in chloralose-anesthetized cats by observing the cardiovascular responses to sudden interruption of this activity and to afferent stimulation of the cardiac nerves.Abstract:
The influence of the rhythmic activity in cardiac vagal afferents on the circulation was analyzed in chloralose-anesthetized cats by observing the cardiovascular responses to sudden interruption of this activity and to afferent stimulation of the cardiac nerves. The evoked responses were compared with those produced by “unloading” and stimulation of arterial baroreceptors. — Elimination of the impulse traffic in vagal afferents produced a blood pressure rise, a tachycardia and vasoconstrictions in skeletal muscle, intestine and kidney, indicating a tonic restraint of these afferents on the medullary vasomotor centre. The responses were generally moderate in the presence of normally functioning arterial baroreceptors but were pronounced after elimination of “buffering” influences from these receptors. — Comparisons of the inhibitory influences from vagal cardiac afferents and baroreceptor afferents, respectively, on the vasomotor centre indicated that the former were preferentially directed to neurons controlling the efferent discharge to the heart and the renal vessels. There was no evidence for a particularly strong engagement of the capacitance vessels in reflex patterns mediated through cardiac afferents. — Low frequency afferent stimulation of the cardiac nerves generally induced a profound brady-cardia, which was probably due to stimulation of fibres not normally tonically active.read more
Citations
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Evolution of cardiovascular baroreceptor control
TL;DR: During animal evolution the circulatory system has shown a progressive modification in structure, function and short‐term control.
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Brief Reviews Circulatory Reflexes from Mechanoreceptors in the Cardio-Aortic Area
TL;DR: Some recent developments in the study of the baroreflexes originating from the aortic arch, the chambers of the heart, and the coronary vessels are reviewed and whether these reflexes are tonically active in normal situations is discussed.
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Evidence for a depressor reflex elicited from left ventricular receptors during occlusion of one coronary artery in the cat.
TL;DR: It is concluded that acute occlusions of one coronary artery induce a reflex bradycardia and vasodilatation, in all probability due to activation of left ventricular mechanoreceptors, and the vascular responses in this inhibitory reflex seem to be significantly moderated by influences from the arterial baroreceptor.
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Cardiopulmonary receptor modulation of plasma renin activity in normotensive and hypertensive subjects
Guido Grassi,Cristina Giannattasio,A. Saino,E Sabadini,A Capozi,Lorena Sampieri,Cesare Cuspidi,Giuseppe Mancia +7 more
TL;DR: Observations indicate that cardiopulmonary receptors modulate plasma renin activity in humans, and this control in hypertension is unclear.
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The neuroendocrine response to multiple trauma
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References
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Journal Article
Comparative studies on the adrenergic neuro-hormonal control of resistance and capacitance blood vessels in the cat.
Journal ArticleDOI
Vagal Afferent Fibres
TL;DR: The cervical vagus consists of about 30 thousand fibres of which about 24 000 are sensory in function and about 3 thousand are myelinated and have been the centre of attraction in electrophysiological studies chiefly owing to the relative ease with which impulses can be recorded in them.
Journal ArticleDOI
A study of right and left atrial receptors.
TL;DR: It will be shown that all such receptors encountered so far arose in the right and left atria of the heart; these will be referred to as type B atrial receptors.
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