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 ?
To simulate the prehypertensive SS baroreceptor systemic phenotype of partial baroreceptor impairment (10,13), a chronic bilateral aortic denervation was performed instead of a chronic bilateral carotid sinus denervation, because the destruction of chemoreceptors during the carotid sinus denervation (22,23) in a species like the rat, which lacks functional aortic body chemoreceptors (25), causes chronic hypoventilation with consequent chronic systemic hypoxia, which in turn has the chronic effect of lowering blood pressure (23).
In the older picture, the baroreceptor response is blunted with age, perhaps as a result of stiffer arteries.
Central nitric oxide attenuates the baroreceptor reflex in conscious rabbits.
The value of heart rate variability and baroreceptor sensitivity, markers of autonomic nervous function, in predicting SCD is similarly unknown.
As a chemoreceptor, it is distinct from the carotid sinus, which is a baroreceptor.
Maintaining SABP involves compensatory mechanisms such as baroreceptor reflexes, vasoconstriction, and the pumping effect of the skeleton muscles and the lungs that help facilitate venous return to the heart.
Attenuation of the baroreceptor reflex by general anesthetic agent in the normotensive rat.
One, CPAP may reduce sympathetic activation by causing a resetting of baroreceptor sensitivity.
The mechanism by which n-3 FA influences HRV is thought to involve the modulation of adrenergic-mediated baroreceptor activity or enhancement of vagal activity (Mozaffarian et al.
Baroreceptor reflexes cannot regulate blood pressure in the long term, because receptor firing rates adapt to prolonged changes in blood pressure.
The researchers found that nitric oxide is a potent regulator of BDNF in baroreceptor neurons.
The concomitant use atropine with associated tachycardia can exacerbate the pressor effects of phenylephrine (and prevent appropriate baroreceptor induced bradycardia), especially in infants.