A patient with renal artery stenosis has persistent hypertension.
Which system is primarily responsible?
A. Kallikrein-kinin system
B. RAAS activation
C. ANP release
D. Decreased aldosterone
Answer: B. RAAS activation
Explanation: Renal hypoperfusion → renin release → Angiotensin
II → vasoconstriction & aldosterone → ↑ BP.