Which is neither reabsorbed nor secreted by the tubular cells of nephron ?

Options

A. Glucose
B. Urea
C. Uric acid
D. Inulin

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a substance that is neither reabsorbed nor secreted by the tubular cells of the nephron.

2. **Identifying the Options**: The options provided are glucose, urea, uric acid, and inulin.

3. **Analyzing Glucose**:
- Glucose is completely reabsorbed in the proximal convoluted tubule (PCT) of the nephron.
- Therefore, glucose is not the answer.

4. **Analyzing Urea**:
- Urea is a waste product formed from the breakdown of amino acids.
- While some urea is reabsorbed, a significant amount is excreted.
- Thus, urea is not the answer.

5. **Analyzing Uric Acid**:
- Uric acid is also a waste product and is secreted in small amounts.
- Therefore, uric acid is not the answer.

6. **Analyzing Inulin**:
- Inulin is a substance that is neither reabsorbed nor secreted by the nephron.
- When ingested, it is completely excreted by the kidneys without any reabsorption or secretion.
- Inulin is used clinically to estimate the glomerular filtration rate (GFR), which assesses kidney function.

7. **Conclusion**: The substance that is neither reabsorbed nor secreted by the tubular cells of the nephron is **inulin**.

### Final Answer:
**Inulin** is the substance that is neither reabsorbed nor secreted by the tubular cells of the nephron.

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