ANATOMY

Detailed explanation-1: -The majority of water reabsorption that occurs in the nephron is facilitated by the AQPs. Most of the fluid that is filtered at the glomerulus is then reabsorbed in the proximal tubule and the descending limb of the loop of Henle.

Detailed explanation-2: -distal convoluted tubule. Most absorption and secretion occurs in this part of the nephron.

Detailed explanation-3: -The human kidneys produce approximately 160–170 L of ultrafiltrate per day. The proximal tubule contributes to fluid, electrolyte, and nutrient homeostasis by reabsorbing approximately 60%–70% of the water and NaCl, a greater proportion of the NaHCO3, and nearly all of the nutrients in the ultrafiltrate.

Detailed explanation-4: -So, the correct answer is ‘Proximal convoluted tubule’.

Detailed explanation-5: -Nearly 70−80% of electrolytes and water from the filtrate are reabsorbed in PCT (proximal convoluted tubule). Hence, if a person is suffering from water deficiency, maximum water reabsorption from filtrate will occur in PTC. Q.