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 ?
Approximately 200- 500 data points measured over 30-50s were used to construct a baroreceptor function curve using Sigma Plot software.
Arterial baroreceptor information affects striatal dopamine release measured by voltammetry in rats.
With the use of existing experimental data of the aging human aorta, the researchers were also able to find how the stiffening of the aorta with age causes the baroreceptors to misinform the central nervous system about blood pressure.
The present study, performed in primarilynormotensive rats, had two objectives: 1) to test the effects of sequential exposure, first to a LNa diet for 7 days and then to a HNa diet for 21 days, in rats with and without partial arterial baroreceptor impairment (to simulate the prehypertensive SS baroreceptor systemic phenotype) on SSi and on MAP after 21 days on a HNa diet, and 2) to study the roles of plasma NO bioavailability (pNOB), renal medullary superoxide anion production, and renal mRNA expression of NAD(P)H oxidase and superoxide dismutase (SOD) in such responses.
If neostigmine and atropine are administered simultaneously, cardiac baroreceptor sensitivity is disrupted at least for 2 hours.
Bradycardia and hypotension occur due to inhibition of nor-adrenaline secretion and increased reflex baroreceptor activity.
As outlined in the introduction section, the relationship between hypoalgesia and cardiovascular reactivity may be mediated by any of the following three basic mechanisms modulated by the hypothalamus (paraventricular nucleus): baroreceptor reflex arc stimulation, endogenous opioid responsivity, and descending pain-modulating pathways (Bruehl & Chung, 2006; France & Ditto, 1996; McCubbin, 1991).
This theory postulates that fluids within the dentinal tubules are disturbed either by thermal, physical or osmotic changes and these fluid changes or movements stimulate a baroreceptor which leads to neural discharge.
1976 Respiratory modulation of baroreceptor and chemoreceptor reflexes affecting heart rate and cardiac vagal efferent nerve activity.
implications for understanding baroreceptor reflex circuitry.