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Semen is made up of sperm (male cells for sexual reproduction) floating in a fluid called seminal plasma. Sperm, also called spermatozoa, are made by a man's testicles and mature (grow up) in the epididymis. The fluids in seminal plasma come from different glands in the man's body: the seminal vesicles, prostate and bulbourethral glands (also called the Cowper's glands).
These seminiferous tubules are considered the functional elements of the testes. It is within these tubules that sperm is created. This process is known as spermatogenesis. Sperm is created at a phenomenal speed, the testes can create over a million per day, which rounds out to thousands of sperm per second.