| Statement A: When the urine moves through the descending limb, it becomes hypertonic and as it passes through the ascending limb of Henles loop, it becomes hypotonic. |
| Statement B: The descending limb is permeable to sodium ions, while the ascending limb is impermeable to sodium ions. |
A) Both statement A and B are wrong
B) Both statement A and B are correct
C) Statement A is correct and B is wrong
D) Statement A is wrong and B is correct
Correct Answer: C
Solution :
The descending limb of loop of Henie is permeable to water. Its surrounding tissue fluid is hypertonic. Hence, the water moves out and the \[N{{a}^{+}}\]and\[C{{l}^{-}}\] moves in the descending limb by passive transport. Therefore, the filterate in the descending limb becomes hypertonic. The ascending-limb of Henles loop is impermeable to the water. The \[N{{a}^{+}}\] and \[C{{l}^{-}}\] moves out by active transport. Hence, the filterate finally becomes hypotonic.
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