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Reproductive system
The sperm production (spermatogenesis) is continuous in adult men. One germinative cell (unspecialized cell) takes approximately 72 to 74 days to develop and originate a mature spermatozoon and to be dragged to the epididymis (an organ adjacent to the testicle). The spermatozoa are stocked into the epididymis until the ejaculation.
The spermatozoa coming from the epididymis go though the vans deferens, prostate and receive the liquid from the seminal vesicles to form the semen. During the ejaculation this liquid runs into the urinary channel (urethra) until exterior elimination. The ability of liberate an adequate amount of spermatozoa into the vagina is an important factor for male fertility. Any alteration in this mechanism of emission and/or production of spermatozoa can lead to infertility.
The increase of body temperature due to fever and excessive exposition to heat (e.g.: hot tubes or baths) are common causes of alteration in seminal production and reduction in the sperm production, motility, and in spermatozoa morphology. The sperm production is adequate at 35°C, a temperature inferior to the basal body temperature. This is the reason why the testicles are in the scrotum and its ability to approximate or distance from the body to maintain the temperature.
