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STD 11 - 16. Excretory product and their elimination — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 16. Excretory product and their elimination1 Mark
MCQ
A fall in glomerular filtration rate $(GFR)$ activates
  • ✓
    juxtaglomerular cells to release renin
  • B
    adrenal cortex to release aldosterone
  • C
    adrenal medulla to release adrenaline
  • D
    posterior pituitary to release vasopressin.
✓

Answer

Correct option: A.
juxtaglomerular cells to release renin
a
(a) : The amount of the filtrate formed by the kidneys per minute is called glomerular filtration rate $(GFR)$. $GFR$ in a healthy individual is approximately $125\ ml/minute$, $i.e$., $180\ litres$ per day.The kidneys have built­in mechanisms for the regulation of glomerular filtration rate. One such efficient mechanism is carried out by juxtaglomerular apparatus $(JGA)$. $JGA$ is a special sensitive region formed by cellular modifications in the distal convoluted tubule and the afferent arteriole at the location of their contact. A fall in $GFR$ can activate the $JG$ cells to release renin which can stimulate the glomerular blood flow and thereby the $GFR$ come back to normal.

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