When fluid flow through the ascending loop of Henle increases as a result of increased GFR, the macula densa cells send a chemical message to the neighboring afferent arteriole. The afferent arteriole constricts, increasing resistance and decreasing GFR. This type of autoregulation involving both the kidney tubule and the arteriole is known as ________.   myogenic tone b. macula densa cells c. countercurrent multiplication d. tubuloglomerular feedback e. juxtaglomerular feedback

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