The Juxtaglomerular Apparatus (JGA) releases Renin in response to:
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Official Solution & Conceptual RationaleNCERT Class 11 Biology - Excretory Products and Elimination
A fall in glomerular blood flow/blood pressure stimulates JG cells to secrete Renin, activating the RAAS (Renin-Angiotensin-Aldosterone System) to restore blood pressure and GFR.