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reproduction - Reproduction(again an abbreviated version...

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Reproduction ( again, an abbreviated version since we're behind ): Human reproductive system: Male system: - externally, consists of scrotum and penis. - internally [Fig. 46.11, p. 1005] : - sperm forms in the testes. But, body temperature is too high for normal formation of sperm, so the testes must be kept outside body (in the scrotum, which is about 2 degrees colder than the body). - in many animals, testes don't descend except during the breeding season. In a few, body temperature seems to be low enough. - epididymis - from the testes, sperm move into the epididymis. This is basically a coiled tube. Sperm are matured and stored here. It takes about 20 days for sperm to move through the epididymis. - vas deferens - during ejaculation, sperm are moved from the epididymis into the vas deferens. The vas deferens joins a short duct coming from: - seminal vesicles - these contribute volume, but also fructose (energy) and other items (mucus, enzymes, ascorbic acid, and prostaglandins). - the duct from the seminal vesicles joins that from the vas deferens, forming a short ejaculatory duct, which then runs into the urethra (urethra is coming from bladder). - prostate gland - a large gland at the base of the bladder. The ejaculatory duct and urethra join up within gland. This contributes more anticoagulant enzymes, and some more nutrients. - This causes the most common medical problem in men over age 40, and enlarges in about half these cases - almost all men over 70 have enlarged prostates - usually this is noncancerous, but it obviously needs to be checked. - bulbourethral glands - secrete a clear mucus before ejaculation.
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