Middle piece of sperm contains

Options

A. mitochondria and golgi body
B. centriole and golgi body
C. axial filament and golgi body
D. mitochondria and axial filament

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of Sperm**:
- Sperm is the male reproductive gamete and consists of three main parts: the head, the middle piece (midpiece), and the tail.

2. **Identifying the Components of Each Part**:
- **Head**: Contains the nucleus and acrosome. The nucleus has densely coiled chromatin fibers and contains DNA, while the acrosome has enzymes for penetrating the female egg.
- **Middle Piece**: This part is crucial for the sperm's energy supply during its journey. It contains mitochondria and axial filaments.
- **Tail**: Primarily consists of flagella, which aids in the movement of the sperm.

3. **Focusing on the Middle Piece**:
- The middle piece is specifically known for housing mitochondria, which are the powerhouses of the cell, providing energy.
- Additionally, it contains axial filaments that are coiled around the mitochondria, which help in the movement of the sperm.

4. **Evaluating the Options**:
- **Option A**: Mitochondria and Golgi body - Incorrect, as Golgi body is not present in sperm.
- **Option B**: Centriole and Golgi body - Incorrect, as Golgi body is not present and centriole is located in the neck region.
- **Option C**: Axial filament and Golgi body - Incorrect, as Golgi body is absent.
- **Option D**: Mitochondria and axial filament - Correct, as both are present in the middle piece.

5. **Conclusion**:
- The middle piece of the sperm contains mitochondria and axial filaments, making Option D the correct answer.