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A fall in glomeruclar filtration rat (GFR) activates

  • Juxtra glomerular cells to release renin

  • Adrenal cortex to release aldosterone

  • Adrenal medulla to release adrenaline

  • Posterior pituitary ot release vasopressin

Answer

A.

Juxtra glomerular cells to release renin

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.

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.