Wednesday 11 July 2012

SPERMS PRODUCTION

The testes contain coiled structures called seminiferous tubules, which are the sites of sperm production. They produce over 12 billion sperm per month. The epididymis lies on top of the seminiferous tubules. Immature sperm migrate from the seminiferous tubules to the epididymis to mature & be stored.

Sperm are produced, stored, & delivered by the male reproductive process. The male reproductive process includes the testes, urethra, vas deferens, prostate gland, seminal vesicle, & penis.

Before intercourse, the penis fills with blood & becomes erect. With sufficient stimulation, the ejaculatory technique begins.

The mature sperm travel from the epididymis through the vas deferens. The vas deferens is a narrow, muscular tube about 18 inches long. Its smooth muscle contractions propel the sperm forward. They arrive first at the ampulla, the widest part of the vas deferens, & then pass in to the ejaculatory ducts. In the ejaculatory ducts, a liquid secretion from the seminal vesicles mixes with the sperm. Seminal liquid contains fructose sugar, which the sperm use as fuel as well as alkalines, which help to counteract the naturally acidic surroundings of the vagina & uterus providing the sperm a better chance for survival.

The liquid mixture is propelled forward through the ejaculatory ducts toward the urethra, passing first through the prostate gland, where milky prostatic liquid is added, forming the substance they call semen. The prostatic liquid helps the sperm swim faster, which is important for getting to the egg cell.

Finally, about a teaspoon of semen is ejected out (ejaculated) through the far finish of the urethra at the finish of the penis. From the time the sperm leave the man's body, they have between 12 & 48 hours to find & fertilize the egg cell, assuming an egg is available. Of the 300 million sperm ejaculated, only about 200 or so will survive to reach the egg cell & will succeed in fertilizing it.

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