<P> The baroreflex or baroreceptor reflex is one of the body 's homeostatic mechanisms that helps to maintain blood pressure at nearly constant levels . The baroreflex provides a rapid negative feedback loop in which an elevated blood pressure reflexively causes the heart rate to decrease and also causes blood pressure to decrease . Decreased blood pressure decreases baroreflex activation and causes heart rate to increase and to restore blood pressure levels . The baroreflex can begin to act in less than the duration of a cardiac cycle ( fractions of a second ) and thus baroreflex adjustments are key factors in dealing with postural hypotension , the tendency for blood pressure to decrease on standing due to gravity . </P>
<P> The baroreflex or baroreceptor reflex is one of the body 's homeostatic mechanisms that helps to maintain blood pressure at nearly constant levels . The baroreflex provides a rapid negative feedback loop in which an elevated blood pressure reflexively causes the heart rate to decrease and also causes blood pressure to decrease . Decreased blood pressure decreases baroreflex activation and causes heart rate to increase and to restore blood pressure levels . The baroreflex can begin to act in less than the duration of a cardiac cycle ( fractions of a second ) and thus baroreflex adjustments are key factors in dealing with postural hypotension , the tendency for blood pressure to decrease on standing due to gravity . </P>
in the carotid sinuses and aortic arch detect increases in blood pressure
in the carotid sinuses and aortic arch detect increases in blood pressure
baroreceptor reflex
baroreceptor reflex