In which region of the nephron does the fractional reabsorption of water vary the most in response to variation in the state of hydration?

Question

Quizplus · Accepted Answer

The collecting duct is the region of the nephron where the fractional reabsorption of water varies the most in response to variation in the state of hydration. It is regulated by the release of antidiuretic hormone (ADH), which promotes water reabsorption and concentration of urine. When an individual is dehydrated, ADH levels increase, resulting in increased water reabsorption in the collecting duct and less water excretion in the urine. Conversely, when an individual is well hydrated, ADH levels decrease, resulting in less water reabsorption in the collecting duct and more water excretion in the urine.

In Which Region of the Nephron Does the Fractional Reabsorption