The maintenance of high osmolarity of medullary interstitial fluid is due to-

1.Henle's loop

2.PCT

3.DCT

4.Collecting Duct

Which of the following option is completely permeable to water and impermeable to electrolytes?

1.Descending limb of the loop of Henle

2.Ascending limb of loop of Henle

3.Loop of Henle

4.DCT

Which of the following option is impermeable to water but permeable to electrolytes?

1.Descending Limb of the loop of Henle

2.Ascending limb of loop of Henle

3.Loop of Henle

4.DCT

The concentrated filtrate gets diluted due to

1.Passage of electrolytes to the medullary fluid

2.Passage of water to the inner side of tubules

3.Passage of both water and electrolytes to the inner side of tubule

4.Both A and B

Conditional reabsorption of sodium and water takes place in which of the following segments?

1.PCT

2.DCT

3.AL of LOH

4.DL of LOH

Which of the following does not get selectively secreted by DCT cells?

1.K+

2.H+

3.Ammonia

4.Carbonate

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