The medullary interstitial fluid of a patient is highly concentrated than a normal person. As compared to a normal person. As compared to a normal individual , the patient's urine will be

Options

A. concentrated
B. dilute
C. isotonic
D. both (B) and (C )

Answer

To solve the question regarding the urine concentration of a patient with highly concentrated medullary interstitial fluid compared to a normal individual, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Medullary Interstitial Fluid**:
- The medullary interstitial fluid is located in the kidney's medulla and is crucial for the concentration of urine. It surrounds the loops of Henle and plays a significant role in the reabsorption of water.

**Hint**: Recall that the kidney's medulla is involved in urine concentration through the counter-current mechanism.

2. **Concentration of Medullary Interstitial Fluid**:
- In the patient described, the medullary interstitial fluid is highly concentrated. This indicates that there is a higher osmolarity in the interstitial fluid compared to a normal individual.

**Hint**: Think about how the concentration gradient affects water movement during urine formation.

3. **Effect on Water Reabsorption**:
- A highly concentrated medullary interstitial fluid promotes the reabsorption of water from the collecting ducts back into the bloodstream. This means that more water is reabsorbed, leading to less water being excreted in the urine.

**Hint**: Remember that the kidneys adjust urine concentration based on the body's hydration status.

4. **Resulting Urine Concentration**:
- Since more water is reabsorbed due to the high concentration of the medullary interstitial fluid, the urine produced by the patient will be more concentrated than that of a normal individual.

**Hint**: Consider the relationship between water reabsorption and urine concentration.

5. **Conclusion**:
- Therefore, the patient's urine will be concentrated urine, as opposed to dilute urine typically produced by a normal individual.

**Hint**: Summarize the findings: concentrated medullary interstitial fluid leads to concentrated urine.

### Final Answer:
The patient's urine will be **highly concentrated**.