A) adrenal medulla to release adrenaline
B) juxtaglomerular cells to release renin
C) posterior pituitary to release vasopressin
D) adrenal cortex to release aldosterone.
Correct Answer: B
Solution :
: A fall in glomerular blood flow/glomerular blood pressure/GFR can activate the JG cells to release renin which 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 GFR. Angiotensin II also activates the adrenal cortex to release aldosterone. Aldosterone causes reabsorption of \[N{{a}^{+}}\] 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 the Renin-Angiotensin mechanism.
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