ANATOMY

Detailed explanation-1: -Final answer: Proximal convoluted tubule is involved in reabsorption of water even in presence of hormone ADH (Anti-diuretic hormone).

Detailed explanation-2: -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-3: -In renal physiology, reabsorption or tubular reabsorption is the process by which the nephron removes water and solutes from the tubular fluid (pre-urine) and returns them to the circulating blood.

Detailed explanation-4: -The walls of the thick ascending limb are impermeable to water, so in this section of the nephron water is not reabsorbed along with sodium.

Detailed explanation-5: -Glucose, amino acids, salts and high amount of water are reabsorbed in the nephron during the second step of urine formation, i.e., the selective reabsorption.