How does the Collecting Duct contribute to the maintenance of the osmolarity of the body fluids?

How does the Collecting Duct contribute to the maintenance of the osmolarity of the body fluids?
  1. By reabsorbing urea
  2. By secreting urea
  3. By reabsorbing water
  4. By secreting water

Solution

The Collecting Duct allows the passage of small amounts of urea into the medullary interstitium, thereby keeping up the osmolarity.

Asked in: NCERT

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