Compare obligatory water reabsorption with facultative water reabsorption.
A)Obligatory water reabsorption cannot be prevented,whereas facultative water reabsorption can be precisely controlled.
B)Obligatory water reabsorption can be precisely controlled,whereas facultative water reabsorption cannot be prevented.
C)Obligatory water reabsorption occurs in the distal convoluted tubule under control of ADH,whereas facultative water reabsorption occurs in the proximal convoluted tubule following the osmotic gradient.
D)Obligatory water reabsorption occurs in the ascending limb of the nephron loop,whereas facultative water reabsorption occurs in the descending limb of the nephron loop.
E)Obligatory water reabsorption is responsible for regulating the final concentration and volume of water lost in urine,whereas facultative water reabsorption is responsible for about 85 percent of water reabsorbed out of the filtrate.

Question

Quizplus · Accepted Answer

Obligatory water reabsorption refers to the process that occurs as water passively follows the reabsorbed solutes out of the filtrate, which cannot be prevented. Facultative water reabsorption, on the other hand, is regulated by antidiuretic hormone (ADH) and can be adjusted to control the final concentration of urine, making it a precisely controlled process.

Compare Obligatory Water Reabsorption with Facultative Water Reabsorption