Middle piece of mammalian sperm possess only mitochondria

Explanation:
The mammalian sperm is a highly specialized cell that has a unique structure and composition. The middle piece of the mammalian sperm is the region that connects the head and the tail of the sperm. This region is responsible for the generation of ATP, which is required for the movement of the sperm. The middle piece of the mammalian sperm contains only mitochondria.

Mitochondria in the middle piece of the sperm:
Mitochondria are the powerhouses of the cell, responsible for the generation of ATP. The middle piece of the mammalian sperm contains a high concentration of mitochondria, which provides the energy required for the movement of the sperm. The mitochondria in the middle piece of the sperm are arranged in a spiral pattern, which helps in the generation of ATP.

Functions of the middle piece of the sperm:
The middle piece of the sperm has two primary functions:

1. Generation of ATP:
As mentioned earlier, the middle piece of the mammalian sperm contains a high concentration of mitochondria, which generates ATP. ATP is required for the movement of the sperm, and without it, the sperm would not be able to swim and fertilize the egg.

2. Anchorage of the tail:
The middle piece of the sperm also serves as an anchor point for the tail. The tail of the sperm is responsible for the movement of the sperm, and it is attached to the middle piece. The mitochondria in the middle piece provide the energy required for the movement of the tail, which helps in the movement of the sperm.

Conclusion:
In conclusion, the middle piece of the mammalian sperm contains only mitochondria, which generate ATP required for the movement of the sperm. The middle piece also serves as an anchor point for the tail, which is responsible for the movement of the sperm.

The middle piece of human sperm contains the mitochondria coiled around the axial filament called mitochondrial spiral. They provide energy for the movement of the sperm.
At the end of the middle piece there is a ring centriole (annulus) with unknown functions. looks like option a is correct !