In a mammalian sperm, mitochondria around the axial filament are present in the region of

Options

A. Head
B. Middle piece
C. Principal piece of tail
D. All of the above

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of Sperm:**
- A mammalian sperm consists of three main parts: the head, middle piece, and tail.
- The head contains the nucleus and the acrosome, which is essential for fertilization.

2. **Identifying the Middle Piece:**
- The middle piece of the sperm is located between the head and the tail.
- It is crucial for the sperm's motility.

3. **Location of Mitochondria:**
- Mitochondria are organelles that produce energy.
- In mammalian sperm, mitochondria are specifically located around the axial filament in the middle piece.

4. **Function of Mitochondria:**
- The mitochondria provide the necessary energy for the movement of the sperm.
- This energy is vital for the sperm to swim and reach the egg for fertilization.

5. **Conclusion:**
- Therefore, the correct answer to the question is that mitochondria around the axial filament are present in the middle piece of the mammalian sperm.

**Final Answer:** The mitochondria around the axial filament are present in the **middle piece** of the mammalian sperm.

---