When a person is suffering from poor renal reabsorption,which of the following will not help in the maintenance of blood volume?

Select the correct option with respect to the following statements:
$(a)$ Angiotensin $II$ constricts arterioles in the kidney to reduce blood flow and decreases blood pressure when blood flow to the afferent arteriole decreases.
$(b)$ Angiotensin $II$ stimulates the adrenal cortex to release aldosterone for more absorption of $Na^+$ and $Cl^-$ ions in the $DCT$.
$(c)$ Blood osmolarity varies with the secretion of aldosterone and $ANP$.

An excessive loss of fluid from the body can activate osmoreceptors which stimulate the hypothalamus to release .............. from the neurohypophysis.

The endocrine structure of the kidney is .....

Renin is secreted by

What is $RAAS$?