Question

A large amount of water reabsorption to produce concentrated urine takes place in ________.
1. PCT
2. DCT
3. Loop of Henle
4. Collecting Duct

Answer 1

Correct Answer - Option 4 : Collecting Duct

The correct answer is Collecting Duct.

• The collecting duct is the long tubule from the cortex of the kidney to the inner medulla.

• A large amount of water reabsorption takes place to produce concentrated urine.
• It also plays an important role in the maintenance of pH and ionic balance of the blood.
• PCT is the duct made up of cuboidal brush border epithelium which increases surface area for reabsorption.
• Nearly 80% of electrolytes and water are reabsorbed in this segment.
• Loop of Henle is permeable to electrolytes and impermeable to water which helps in maintaining osmotic balance.
• DCT is the conditional reabsorption of Na+, NH3, and water to balance sodium potassium concentration in the blood.