What mechanisms are responsible for producing concentrated urine?
A)The juxtamedullary nephrons becoming active.
B)The countercurrent mechanism pulls out much water.
C)Vasopressin promotes more water reabsorption in distal tubule.
D)Both b and c
E)None of the above.

Question

Quizplus · Accepted Answer

The countercurrent mechanism pulls out much water, which is complemented by the action of vasopressin that promotes more water reabsorption in the distal tubule. Therefore, both options b and c are responsible for producing concentrated urine. The juxtamedullary nephrons do not play a significant role in the urine concentration mechanism, so option A is not correct, and option E is not correct either as both b and c are responsible for urine concentration.

What Mechanisms Are Responsible for Producing Concentrated Urine