Number of mitochondria is maximum in part of uriniferous tubule

Options

A. PCT
B. Loop of Henle
C. DCT
D. Bowman's capsule

Answer

To solve the question regarding the part of the uriniferous tubule with the maximum number of mitochondria, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Parts of the Uriniferous Tubule**: The uriniferous tubule consists of different parts, including the Proximal Convoluted Tubule (PCT), Loop of Henle, Distal Convoluted Tubule (DCT), and Bowman's Capsule.

2. **Understand the Function of Each Part**:
- **Proximal Convoluted Tubule (PCT)**: Responsible for the reabsorption of nutrients, electrolytes, and water.
- **Loop of Henle**: Primarily involved in the concentration of urine and the reabsorption of water and salts.
- **Distal Convoluted Tubule (DCT)**: Involved in the further regulation of electrolytes and water.
- **Bowman's Capsule**: Part of the filtration process but does not have a significant role in reabsorption.

3. **Analyze the Energy Requirements**: The PCT has a high energy requirement due to its role in reabsorbing a large amount of substances (70-80% of electrolytes and water). This process is facilitated by active transport mechanisms, which require ATP produced by mitochondria.

4. **Mitochondrial Presence**: Given that the PCT is heavily involved in active transport, it contains a high number of mitochondria to meet its energy demands. The presence of a brush border also indicates a high surface area for absorption, further necessitating energy.

5. **Conclusion**: Based on the analysis, the part of the uriniferous tubule with the maximum number of mitochondria is the **Proximal Convoluted Tubule (PCT)**.

### Final Answer:
The number of mitochondria is maximum in the **Proximal Convoluted Tubule (PCT)**.

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