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(D) The $RAAS$ (Renin-Angiotensin-Aldosterone System) is a critical mechanism for regulating blood pressure and fluid balance.$1$. When blood pressure

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Aldosterone

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(D) The $RAAS$ (Renin-Angiotensin-Aldosterone System) is a critical mechanism for regulating blood pressure and fluid balance.$1$. When blood pressure or glomerular filtration rate $(GFR)$ decreases,the juxtaglomerular $(JG)$ cells release the enzyme Renin.$2$. Renin converts Angiotensinogen in the blood to Angiotensin-$I$,which is further converted to Angiotensin-$II$ by Angiotensin-Converting Enzyme $(ACE)$.$3$. Angiotensin-$II$ acts as a powerful vasoconstrictor and also stimulates the adrenal cortex to release the hormone Aldosterone.$4$. Aldosterone promotes the reabsorption of $Na^+$ and water from the distal parts of the kidney tubules,which increases blood volume and blood pressure.

Angiotensin-$II$ activates the adrenal cortex to release..................

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