Reabsorption of water from distal parts of the tubules is facilitated by hormone ________.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the hormone responsible for the reabsorption of water from the distal parts of the tubules in the nephron.

2. **Identifying the Hormone**: The hormone that facilitates water reabsorption in the distal tubules is known as Anti-Diuretic Hormone (ADH).

3. **Alternative Name**: ADH is also referred to as vasopressin. This is an important detail to remember.

4. **Source of the Hormone**: ADH is secreted by the posterior pituitary gland. This gland plays a crucial role in regulating various bodily functions, including water balance.

5. **Mechanism of Action**: ADH acts on the collecting ducts of the nephron, where it promotes the reabsorption of water. It does this by inducing the translocation of aquaporin channels to the plasma membrane of the collecting duct cells.

6. **Result of ADH Action**: The presence of aquaporin channels allows for increased water permeability in the collecting ducts, leading to more water being reabsorbed into the bloodstream via the renal vein.

7. **Final Answer**: Therefore, the hormone that facilitates the reabsorption of water from the distal parts of the tubules is **vasopressin** (ADH).

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