Q. Counter current mechanism helps to maintain a concentration gradient. This gradient help in
A) Easy passage of water from medulla to collecting tubule and thereby concentrating urine
B) Easy passage of water from collecting tubule to interstitial fluid and thereby concentrating urine
C) Easy passage of water from medullary interstitial fluid to collecting tubule and thereby diluting urine
D) Inhibition of passage of water between the collecting tubule and medulla and so isotonic urine is formed
Explanation
When blood from cortex goes through the descending loop, it loses water and gain salts and salutes. As blood ascends, the reverse occurs and it gains water and gradually loses salts and solutes
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.