Sympathetic vasoconstriction of the afferent arterioles and a resultant fall in the GFR occur as part of the baroreceptor reflex response when the blood pressure is too low.

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When blood pressure is too low, sympathetic vasoconstriction of the afferent arterioles occurs in order to maintain blood pressure and perfusion to vital organs. This results in a fall in the GFR (glomerular filtration rate) as less blood is able to enter the glomerulus. This is part of the baroreceptor reflex response, which is a physiological mechanism that helps to maintain blood pressure homeostasis.

Sympathetic Vasoconstriction of the Afferent Arterioles and a Resultant Fall