Baroreceptors


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Baroreceptors

 

(baroceptors, mechanoreceptors, and pressoreceptors), sensory nerve terminals in blood vessels that perceive changes in blood pressure and reflexly regulate its level. Baroreceptors become stimulated when the walls of the vessels distend. They are found in all vessels but are concentrated mainly in reflexogenic zones (such as cardiac, aortic, carotid sinus, and pulmonary). When blood pressure rises, baroreceptors send impulses to the central nervous system that decrease the tonus of the vascular center and excite the central formations of the parasympathetic division of the autonomic nervous system, and result in a lowering of the pressure. After a frequent and prolonged rise in blood pressure, the baroreceptors adapt to it and thereby may be one of the causes of hypertension.

G. N. KASSIL’

References in periodicals archive ?
Hyperpolarization-activated cyclic nucleotide (HCN) channels, which are also stronglylinked to mechanoreception in arterial baroreceptors, are shown to be upregulated in type 1 diabetes mellitus leading to a reduced baroreceptor function that can be rescued with tempol [22].
sup][12] In addition, surgical removal of a carotid plaque caused immediate partial disruption of the baroreceptor activity leading to increased arterial pressure instability.
Arterial baroreceptor information affects striatal dopamine release measured by voltammetry in rats.
He further explained that if their hypothesis is proven right then arterial stiffness and baroreceptor signaling will become hotspot targets for the treatment of high blood pressure and the development of new medicines and medical devices.
Moreover, our findings strongly suggest that NADH-stimulated RMSAP might be under the inhibitory control of aortic baroreceptors, suggesting again that this response could be mediated by an increase in baseline efferent RSNA.
5] However, the limitations of our study include the small sample size; use of a sphygmomanometer to record BP instead of beat-to beat-BP monitoring (which would have helped determine BP variability and baroreceptor sensitivity) and use of the isometric hand- grip test which is considered insensitive in assessing sympathetic activity.
The system works by electrically activating the baroreceptors located in the carotid artery, the body's natural blood pressure sensors that regulate cardiovascular function.
Baroreceptors could be considered as playing part of a shared physiological modulatory mechanism.
The increased central blood volume via arterial baroreceptors imposes a greater vagal activation and reduces heart rate and cardiac output (Rowell, 1993).
IX), baroreceptors (X), pulmonary distension receptors (X), intestinal
Reflex effects of hepatic baroreceptors on renal and cardiac sympathetic nerve activity.