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. This is due to the action of antidiuretic hormone (ADH), which regulates water reabsorption in the collecting duct based on the body's hydration status. When the body is dehydrated, ADH levels increase, causing more water to be reabsorbed from the collecting duct back into the bloodstream. Conversely, when the body is well-hydrated, ADH levels decrease, leading to less water reabsorption and increased urine output.

In Which Region of the Nephron Does the Fractional Reabsorption