Answer:
Renin is released from
the Juxta-Glomerular Apparatus (JGA) on activation by fall in the glomerular
blood pressure/flow. Renin converts angiotensinogen in blood to angiotensin I and
further to angiotensin II. Angiotensin II, being a powerful vasoconstrictor,
increases the glomerular blood pressure and thereby Glomerular Filteration Rate
(GFR).
Angiotensin II also
activates the adrenal cortex to release aldosterone. Aldosterone causes reabsorption
of 
and
water from the distal parts of the tubule. This also, leads to an increase in
blood pressure and GFR. This complex mechanism is generally known as Renin Angiotensin
Aldosterone System or RAAS.
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