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The Reproductive System

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Length: 754 words (2.2 double-spaced pages)
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The Reproductive System

The reproductive system occurs in both male and female.

Like in plants it is the male gamete that needs to be transferred to
the female gamete. The female gamete is fertilised and develops inside
the mother’s body so the reproductive systems of both males and
females are highly adapted for this.

Production of sperm is called spermatogenesis.

It occurs at puberty and for the rest of there life.

It takes place in the gonads of the male - the testes. Over 100
million can be made in one day!

Each testis is composed of numerous tiny tubes called seminiferous
tubules. It is in the walls of these tubules that sperm production
actually takes place.

Development begins in the outer side of the wall in a layer of cells
called the germinal epithelium. As the immature sperm cells become
more mature they move to the inner side and break way into the lumen
of the tubule to be carried away to the epididymis for storage. The
process of this production is shown in the next two diagrams.

In b...


... middle of paper ...


...ogesterone: this stimulates the
thickening and the vascularisation of the uterus wall in preparation
for pregnancy...

A) If no pregnancy occurs: the corpus luteum degenerates, progesterone
is no longer released and the lining of the uterus breaks down. The
discharge of the wall is called menstruation. FSH release is no longer
inhibited so the cycle can begin again and a new follicle can develop

b) If pregnancy occurs: the corpus luteum persists due to a hormone (CG
- chorionic gonadotrophin) being released.

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