Renin–Angiotensin–Aldosterone
unseel.com · renin  ·  angiotensin II  ·  aldosterone  ·  blood pressure
pressure 120/80 mmHg
stage resting
renin low
step —
kidney (juxtaglomerular cells)
renin → angiotensin II
blood vessel (vasoconstriction)
aldosterone / Na⁺ & water
Unseel.com · RAAS