Which segment allows the passage of small amounts of urea into the medullary interstitium to keep up the osmolarity?

1.PCT

2.DCT

3.LOH

4.Collecting Duct

Which of the following organisms have the capacity to concentrate urine?

1.Mammals

2.Fishes

3.Reptile

4.Amphibians

Which of the following is the correct way of writing the unit of osmolarity?

1. Mosmo/L

2. mOsmol/L

3. MOsmo/L

4. mOSMol/L

The gradient is mainly caused by

1.NaCl

2.Urea

3.Both A and B

4.Ammonia

The NaCl is transported by the ascending limb of Henle's loop which is exchanged with the…….

1. Ascending limb of vasa recta

2. Descending limb of vasa recta

3. Ascending limb of LOH

4. Descending limb of LOH

NaCl is returned to the interstitium by

1.Ascending portion of LOH

2.Ascending portion of vasa recta

3.Descending portion of LOH

4.Descending portion of vasa recta

Urea will enter the

1.Thin segment of AL of LOH

2.Thick segment of AL of LOH

3.Descending Limb of LOH

4.All of these

Urea is transported back to the interstitium by

1.Collecting Tubule

2.DCT

3.PCT

4.LOH

How many times can human urine be concentrated in counter-current mechanism?

1.Four times

2.Five times

3.Three times

4.Two times

Countercurrent mechanism helps in maintenance of

1.Concentration gradient in the medullary interstitium.

2.Concentration gradient in the cortical interstitium

3.Concentration gradient in the lumen of collecting duct

4.Concentration gradient in the lumen of DCT