Sperms are also termed as the male gametes that combine with female eggs to produce offspring. Some of the primary characteristics of sperm are- Testes produce millions of sperm in a male body. Each sperm has a head, a middle piece and a tail. These sperms compete with others to reach the female egg. The middle part of a sperm contains mitochondria that offer energy during the movement and flow. Sperms are stored in testes as the body temperature of a human body can cause their destruction.