The macula densa
A)consists of specialized tubular cells in the juxtaglomerular apparatus
B)consists of specialized arteriolar smooth-muscle cells in the juxtaglomerular apparatus
C)secretes renin
D)has characteristics a and b
E)has characteristics b and c

Question

Quizplus · Accepted Answer

The macula densa consists of specialized tubular cells in the juxtaglomerular apparatus, located in the distal convoluted tubule of the nephron. It plays an important role in regulating the filtration rate and blood pressure in the kidney by sensing the flow of filtrate and communicating with nearby cells to regulate the release of renin. However, it does not secrete renin itself. Therefore, choices B and C are incorrect. Choice D is incorrect because the macula densa does not consist of arteriolar smooth-muscle cells.

The Macula Densa