Practice question
Question
A fall in glomerular filtration rate (GFR) activates:
Explanation
A reduced GFR decreases NaCl delivery to macula densa, signaling lacis extraglomerular mesangial cells and juxtaglomerular cells to release renin. These three components form the juxtaglomerular apparatus regulating renin-angiotensin-aldosterone system. Argentaffin, Purkinje and chief cells belong to other systems.
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