Which renal condition is a common cause of secondary hypertension due to activation of the Renin-Angiotensin-Aldosterone System (RAAS)?
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Correct answer: Renal artery stenosis
Renal artery stenosis decreases perfusion to the kidney, which the juxtaglomerular apparatus perceives as low blood pressure. This triggers the release of renin, leading to systemic vasoconstriction and sodium retention (Goldblatt kidney mechanism).
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