KCET · BIOLOGY · STD 11 - 16. Excretory Products and their Elimination
A fall in glomerular filtration rate activates
- A adrenal medulla to release adrenaline
- B juxta glomerular cells to release renin
- C posterior pituitary to release vasopressin
- D adrenal cortex to release aldosterone
Answer & Solution
Correct Answer
(B) juxta glomerular cells to release renin
Step-by-step Solution
Detailed explanation
(B) juxta glomerular cells to release renin,
A fall in glomerular blood flow/glomerular blood pressure/GFR can activate the JG cells to release renin which converts angiotensinogen 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 reabsoption of Na 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.
A fall in glomerular blood flow/glomerular blood pressure/GFR can activate the JG cells to release renin which converts angiotensinogen 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 reabsoption of Na 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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