A patient with renal artery stenosis experiences increased renin secretion. Which mechanism explains why systemic blood pressure increases?

💡 Explanation

Increased renin secretion leads to elevated angiotensin II levels, which causes vasoconstriction in systemic arterioles, thereby increasing blood pressure. This occurs because the renin-angiotensin-aldosterone system activates in response to decreased renal blood flow; therefore, the correct answer is vasoconstriction, rather than diuresis via ADH inhibition.

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