Denoting a group of structures secreting regulatory hormones into the arteriole that leads into a glomerulus in the kidney.
- Renin is secreted from the juxtaglomerular apparatus of the kidney in response to glomerular underperfusion or a reduced salt intake.
- The macula densa and JG cells are jointly called the juxtaglomerular apparatus.
- If GFR decreases, the filtrate ion concentration decreases; juxtaglomerular cells then dilate the afferent arteriole and renin is released.
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