What is NOT involved in autoregulation of the GFR?
A) a myogenic mechanism in which the afferent arteriole automatically constricts when it is stretched
B) a tubulo-glomerular feedback mechanism in which vasoactive chemicals released from the juxtaglomerular apparatus bring about afferent arteriolar vasoconstriction
C) sympathetically induced vasoconstriction of the afferent arterioles

Question

Quizplus · Accepted Answer

Sympathetically induced vasoconstriction of the afferent arterioles is not involved in autoregulation of the GFR. Autoregulation refers to the ability of the kidneys to maintain a relatively constant GFR despite changes in blood pressure. This is achieved through the myogenic and tubulo-glomerular feedback mechanisms, which lead to afferent arteriolar constriction when the blood pressure increases. The sympathetic nervous system can cause vasoconstriction of the afferent arterioles, but this is not considered a mechanism of autoregulation.

What Is NOT Involved in Autoregulation of the GFR