Descending limp of loop of henle is -___ and ascending limb is ____to water

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure**: The loop of Henle is a U-shaped structure in the nephron, consisting of a descending limb and an ascending limb. It plays a crucial role in the concentration of urine.

2. **Analyzing the Descending Limb**: The descending limb of the loop of Henle is known to be permeable to water. This means that water can move out of this limb into the surrounding interstitial fluid, allowing for water reabsorption.

3. **Analyzing the Ascending Limb**: The ascending limb of the loop of Henle, in contrast, is impermeable to water. This means that water cannot pass through this part of the loop, and instead, it is involved in the active transport of ions (like sodium and chloride) out of the nephron.

4. **Filling in the Blanks**: Based on the analysis:
- The first blank (for the descending limb) can be filled with "permeable."
- The second blank (for the ascending limb) can be filled with "impermeable."

5. **Final Answer**: Therefore, the complete statement is:
- "Descending limb of loop of Henle is **permeable** and ascending limb is **impermeable** to water."

---