The juxtaglomerular cells (JG cells, or granular cells) are cells in the kidney that synthesize, store, and secrete the enzyme renin
The macula densa is a collection of specialized epithelial cells in the distal convoluted tubule that detect sodium concentration of the fluid in the tubule
Endothelial cells line the inside of every blood vessel in the body.
Angiotensinogen (AGT) is an α-2-globulin produced constitutively and released into the circulation mainly by the liver
Answer : (d)