Which cells in the kidney possess prominent, dark-staining secretory granules?
a. Distal tubule cells
b. Cells in the thin segment of the loop of Henle
c. Collecting duct cells
d. Juxtaglomerular cells
e. Proximal tubule cells
ANS: D
Juxtaglomerular cells—smooth muscle cells of the afferent arteriole—store renin in secretory granules until stimulated to release it.
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