Reabsorption of water from the urine is increased by the hormone ____________while reabosrption of `Na^(+)` from the urine is enhanced by _______________

Answer

To answer the question regarding the hormones involved in the reabsorption of water and sodium from urine, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Function of Water Reabsorption**:
- The reabsorption of water from urine is crucial for preventing excessive water loss from the body and maintaining osmolarity.

2. **Determine the Hormone Responsible for Water Reabsorption**:
- The hormone that stimulates the kidneys to reabsorb water is **ADH** (Antidiuretic Hormone), also known as **vasopressin**.

3. **Explain the Mechanism of ADH**:
- ADH acts on the kidneys by binding to the vasopressin-2 receptors located in the collecting ducts. This binding facilitates the reabsorption of water back into the bloodstream, thus helping to maintain osmolarity.

4. **Identify the Function of Sodium Reabsorption**:
- Sodium reabsorption is essential for maintaining blood volume and blood pressure.

5. **Determine the Hormone Responsible for Sodium Reabsorption**:
- The hormone that enhances the reabsorption of sodium from urine is **aldosterone**.

6. **Explain the Mechanism of Aldosterone**:
- Aldosterone increases sodium reabsorption through various channels and processes such as NaH antiport, Na-glucose symport, and sodium ion channels. As sodium is reabsorbed, water follows, which is important for maintaining extracellular fluid volume.

### Final Answer:
- The reabsorption of water from the urine is increased by the hormone **ADH (vasopressin)**, while the reabsorption of Na⁺ from the urine is enhanced by **aldosterone**.