Which of the following parts of the sperm provides energy for its motility?

Options

A. The head
B. The neck
C. The tail
D. The middle piece

Answer

To determine which part of the sperm provides energy for its motility, we can analyze the structure of the sperm and the function of its components step by step.

### Step-by-Step Solution:

1. **Understanding Sperm Structure**:
- The sperm is a male reproductive cell, which consists of three main parts: the head, middle piece, and tail.

2. **Identifying the Head**:
- The head of the sperm contains the acrosome and the nucleus. The acrosome helps in fertilization by recognizing and penetrating the egg. However, it does not provide energy for motility.

3. **Examining the Neck**:
- The neck connects the head and the middle piece. It contains centrioles which are involved in the first cleavage during fertilization, but it does not play a role in energy provision for motility.

4. **Analyzing the Middle Piece**:
- The middle piece is critical as it contains numerous mitochondria. Mitochondria are known as the "powerhouses" of the cell because they generate ATP (adenosine triphosphate), which is the energy currency of the cell. This energy is essential for the movement of the sperm.

5. **Looking at the Tail**:
- The tail, also known as the flagellum, is responsible for the motility of the sperm. It provides the whip-like motion that propels the sperm forward. However, the energy required for this motion is supplied by the mitochondria located in the middle piece.

6. **Conclusion**:
- Based on the analysis, the part of the sperm that provides energy for its motility is the **middle piece** due to the presence of mitochondria.

### Final Answer:
The correct answer is the **middle piece** of the sperm.