Question
Biology Question on 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
juxta glomerular cells to release renin
Explanation
Solution
The kidneys have built-in 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