Which of the following is involved in autoregulation of the GFR?
a. A myogenic mechanism in which the afferent arteriole automatically constricts when it is stretched
b. A tubuloglomerular feedback mechanism in which vasoactive chemicals released from the juxtaglomerular apparatus bring about afferent arteriolar vasoconstriction
c. Sympathetically induced vasoconstriction of the afferent arterioles
d. Both a and b
e. None of the above
D
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Fill in the blank(s) with the appropriate word(s).
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