RAAS
a)	Is triggered when juxta-glomerular cells of JGA releases renin in response to various stimuli
b)	Is responsible for regulation of kidney function
c)	Is a powerful mechanism responsible for regulation of functioning of heart
d)	Both (a) and (b)

(d)

Both (a) and (b).

Juxta-glomerular apparatus (JGA) operates a multihormonal Renin-angiotensin-Aldosterone System (RAAS. JGA release an enzyme renin in the blood, which initiates chemical reactions that produces angiotensin-II, a potential stimulator of aldosterone (mineralocorticoids) release by the glomerulosa cell. It increases blood pressure, blood volume and completes the feedback circuit by supporting the release of renin