Question

What is the correct option for the maintenance of concentration of urine?

• A. Counter-current produced in two limbs of Henle's loop
• B. Counter-current produced in two limbs of vasa recta
• C. Ascending limb of Henle's loop
• D. Counter-current produced by Henle's loop and vasa recta

Answer 1

The correct option is D Counter-current produced by Henle's loop and vasa recta

The flow of filtrate in the two limbs of Henle’s loop is in opposite directions and thus forms a counter current. The flow of blood through the two limbs of vasa recta is also in a countercurrent pattern. The proximity between the Henle’s loop and vasa recta, as well as the countercurrent in them, help in maintaining the concentration of urine.

So, the correct answer is 'Counter-current produced by Henle's loop and vasa recta'.