Which statement is NOT true for the macula densa?
A) It consists of specialized tubular cells in the juxtaglomerular apparatus
B) It consists of specialized arteriolar smooth-muscle cells in the juxtaglomerular apparatus
C) It secretes renin

Question

Quizplus · Accepted Answer

The macula densa consists of specialized tubular cells in the juxtaglomerular apparatus, not specialized arteriolar smooth-muscle cells (which instead make up the afferent and efferent arterioles in the juxtaglomerular apparatus). The macula densa does not secrete renin; instead, it senses changes in the concentration of sodium and chloride ions in the distal tubule of the nephron and communicates with the adjacent juxtaglomerular cells to regulate renal blood flow and glomerular filtration rate.

Which Statement Is NOT True for the Macula Densa