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

Options

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

Answer

To answer the question "Which is neither reabsorbed nor secreted by the tubular cells of nephron?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Nephron**:
- The nephron is the structural and functional unit of the kidney. It plays a crucial role in filtering blood and forming urine.
- It consists of various parts, including the glomerulus, proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct.

2. **Reabsorption and Secretion**:
- In the nephron, certain substances are reabsorbed back into the bloodstream after filtration, while others may be secreted into the tubular fluid.
- Commonly reabsorbed substances include glucose, amino acids, and ions (like sodium and potassium).
- Nitrogenous wastes such as urea and uric acid are typically secreted or not reabsorbed.

3. **Identifying the Substance**:
- The question asks for a substance that is neither reabsorbed nor secreted by the nephron.
- Among various substances, glucose is completely reabsorbed, and urea is primarily secreted or not reabsorbed.
- Inulin, a type of dietary fiber, is not reabsorbed or secreted by the nephron; it is filtered out and excreted in urine.

4. **Conclusion**:
- Therefore, 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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