NEET2012ZoologyExcretory Products and their EliminationActual
A fall in glomerular filtration rate (GFR) activates
Options
- Ajuxta glomerular cells to release renin
- Badrenal cortex to release aldosterone
- Cadrenal medulla to release adrenaline
- Dposterior pituitary to release vasopressin
Correct answer
A. juxta glomerular cells to release renin
Step-by-step solution
Juxtaglomerular apparatus consists of macula densa and juxtaglomerular cells. The apparatus becomes active when there is decrease in renal blood pressure or decrease in glomerular filtration rate. There is increased absorption of NaCl in ascending limb or loop of Henle. The decreased NaCl content of filtrate activates cells of macula densa to increase secretion of renin from juxta glomerular cells. Renin convert angiotensinogen to angiotensin peptides.