Question

what is the role played by renin angiootensin
in the regulation of kidney function

Answer 1

The renin-angiotensin-aldosterone system  is a well known regulator of blood pressure (BP) and determinant of target-organ damage.

Answer 2

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The renin-angiotensin system or RAS regulates blood pressure and fluid balance in the body. ... Angiotensin II stimulates the release of the hormone aldosterone in the adrenal glands, which causes the renal tubules to retain sodium and water and excrete potassium.