Test: Regulation of Kidney Function (NCERT) - NEET MCQ

This is the correct option as this is not a function of kidneys. Kidneys do not absorb nitrogenous wastes. They remove nitrogenous wastes such as urea and uric acid from the blood.

Changes in blood volume, body fluid volume and ionic concentration activate the osmoreceptors in the body. These receptors further stimulate the hypothalamus to release ADH From the neurohypophysis. ADH increases water reabsorption from DCT and CT, thereby preventing diuresis.

An increase in body fluid volume can switch off the osmoreceptors present in the body which further suppresses  the release of ADH from neurohypophysis. ADH affects the Kidney function by its constricting effects on blood vessels. This will increase the blood pressure and an increase in blood pressure will increase the glomerular blood flow and thereby the GFR. A fall in GFR activates the JG cells to release renin which converts angiotensinogen in blood to angiotensin I which is further convert to angiotensin II. Angiotensin II stimulates the  adrenal cortex to release aldesterone.

When someone drinks lot of water, the volume of bod fluid increases, thic switches off the osmoreceptors in the body and suppresses the ADH release.

Aldosterone is secreted by the outer layer of the adrenal gland. When aldosterone is present in the blood, all the Na⁺ in the filtrate is reabsorbed b the epithelial cells of DCT and collecting duct. Retaining Na⁺ raises the osmotic pressure of the blood and reduces water loss from the body.