why c is incoorect    Q.Which is incorrect statement for regulation of kidney function ? (A) Renin secreted by J.G. cell (B) Renin helpin converts angiotensinogen in blood to angiotensin 1st (C) Angiotensinogen IInd act as vasoconstrictor and increase the glomerular blood pressure and also activate '2 adrenal medula (D) ANF secreted by ventricle of heart and act as vasoconstrictor (1) A and B (2) A, Band C (3) B, C and D (4) C and D

Dear student 

Kindly refer the solution below to the asked query

The statement c is incorrect because angiotensin II (not angiotensinogen II) acts as vasoconstrictor and also activates adrenal cortex not adrenal medulla.
Also statement d is incorrect as ANF is produced by atrium and acts as vasodilator. 

The complete mechanism is as under

Renin converts the angiotensinogen in blood into angiotensin I and further into angiotensin II. Angiotensin II is a powerful vasoconstrictor that increases the glomerular blood pressure and filtration rate. Angiotensin II also stimulates the adrenal cortex of the adrenal gland to produce aldosterone. Aldosterone increases the rate of absorption of sodium ions and water from the distal convoluted tubule and the collecting duct. This also leads to an increase in blood pressure and glomerular filtration rate. This mechanism, known as renin-angiotensin mechanism, ultimately leads to an increased blood pressure.

Hence answer of this question is option (4) .

Regards