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Sperm is a specialized cell that is involved in sexual reproduction in males. It is produced in the testes and is responsible for delivering the male genetic material (DNA) to the female reproductive system during sexual intercourse. The process of sperm production is known as spermatogenesis and it begins at puberty.

Sperm cells are tiny, typically measuring around 50 micrometers in length. They are made up of three parts: the head, midpiece, and tail. The head contains the genetic material, which is tightly packed into a structure called a nucleus. The midpiece is packed with mitochondria, which produce the energy required for the sperm to swim towards the egg. The tail is a flagellum that propels the sperm forward.

In humans and other mammals, sperm are released from the testes and travel through a series of ducts known as the epididymis, vas deferens, and ejaculatory duct. During sexual intercourse, sperm are expelled from the penis through the urethra and enter the female reproductive system. They swim through the cervix and into the uterus, where they may fertilize an egg if present.

The production and quality of sperm can be influenced by a variety of factors, including age, lifestyle, and medical conditions. Problems with sperm production or function can lead to infertility or difficulties with conception.

Research into male reproductive biology is ongoing and aims to better understand the mechanisms of sperm production and function, as well as develop treatments for male infertility.