Which statement does NOT correctly describe 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.
D) It is at a point where the distal tubule passes through.

Question

Quizplus · Accepted Answer

The macula densa is made up of specialized tubular cells in the juxtaglomerular apparatus, not specialized arteriolar smooth-muscle cells. The macula densa plays a role in regulating renin release, but it does not secrete renin itself. The macula densa is located where the thick ascending limb of the loop of Henle contacts the afferent arteriole at the entrance to the glomerulus. Therefore, statement B is incorrect.

Which Statement Does NOT Correctly Describe the Macula Densa