What is the function of $Renin$?

Vasopressin stimulates the reabsorption of water and the reduction of urine secretion. Hence,vasopressin is also called:

$A$ fall in $GFR$ can activate the $JG$ cells to release ...... which can stimulate the glomerular blood flow and thereby the $GFR$ back to normal.

$RAAS$ is a regulatory mechanism for osmoregulation. It includes . . . . . . group of hormones.

Which of the following statements are correct?
$A$. An excessive loss of body fluid from the body switches off osmoreceptors.
$B$. $ADH$ facilitates water reabsorption to prevent diuresis.
$C$. $ANF$ causes vasodilation.
$D$. $ADH$ causes increase in blood pressure.
$E$. $ADH$ is responsible for decrease in $GFR$.
Choose the correct answer from the options given below:

Angiotensin $- II$ increases the blood volume by