What is used as an osmolyte in human beings to increase medullary interstitial osmolality during concentration of urine?
1. TMAO
2. Urea
3. Both a and b 
4. Uric acid

Kidney matrix retains some amount of urea to

1.Maintain a desired osmolarity

2.Maintain metabolism

3.Maintain balance of the body

4.Maintain micturition

Which of the following is not a part of urine formation?

1.Glomerular Filtration

2.Reabsorption

3.Secretion

4.Counter current mechanism

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 is the correct way of writing the unit of osmolarity?

1. Mosmo/L

2. mOsmol/L

3. MOsmo/L

4. mOSMol/L