Respuesta :
In response to low blood pressure, renin produced by the JG apparatus converts angiotensinogen to angiotensin.
A drop in glomerular blood flow or glomerular blood pressure or GFR can stimulate the JG cells to secrete renin which changes angiotensinogen present in the blood to angiotensin I and further to angiotensin II.
Angiotensin II, acting as a strong vasoconstrictor, elevates the glomerular blood pressure and thus GFR. Angiotensin II also stimulates the adrenal cortex to produce Aldosterone.
Aldosterone brings about reabsorption of Na+ as well as water from the distal parts of the tubule. This too results in an increase in blood pressure as well as GFR. This intricate process is commonly known as the Renin-Angiotensin mechanism.
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