What structure within sperm is composed mainly of mitochondria?

Study for the DAT Quantitative Reasoning Test with multiple choice questions and detailed explanations. Hone your skills and get ready for your exam!

The mid-piece of a sperm is primarily responsible for providing the energy necessary for sperm motility through its high concentration of mitochondria. These organelles are crucial because they produce adenosine triphosphate (ATP), which is the energy currency of the cell. The sperm's tail, or flagellum, requires a substantial amount of energy to whip back and forth for swimming, and this energy comes from the ATP generated by the mitochondria located in the mid-piece.

In contrast, the tail is mainly a structure for propulsion, the acrosome contains enzymes that help the sperm penetrate the egg's outer layers, and the head carries the genetic material. While each of these components plays a vital role in the overall function and success of the sperm, it is the mid-piece that is specifically adapted to support the energy needs during the swimming process.

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