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3.12 Male reproductive system

3.12 Male reproductive system . (Sec 4.1 pg 108) . There are two kinds of sexual traits. Primary traits and secondary traits. . Secondary characteristics are not needed for sexual reproduction: Growth spurt Facial hair Underarm hair Pubic hair Deepening of the voice

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3.12 Male reproductive system

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  1. 3.12 Male reproductive system (Sec 4.1 pg 108)

  2. There are two kinds of sexual traits. Primary traits and secondary traits.

  3. Secondary characteristics are not needed for sexual reproduction: • Growth spurt • Facial hair • Underarm hair • Pubic hair • Deepening of the voice • Widening of the shoulders (usually not until the 20s)

  4. Secondary characteristics start with puberty which begins when the brain tells the testes to start producing more testosterone. This usually starts between the ages of 11 and 13.

  5. The primary traits are related to making sperm and delivering it to the egg in the female. All the primary traits relate to these two purposes.

  6. Sperm: • Male gamete • Specialized cell that is designed to fertilize an egg. • Head = Contains the haploid DNA for fertilizing the egg, contains the acrosome to break into the egg. • Middle Piece = Contains mitochondria to power the flagellum. • Tail = Acts as a propeller to push the sperm along.

  7. Male reproductive system has the following parts: • Two testes – these produce the sperm and hang outside the body. This keeps the sperm from overheating. • Scrotum – a skin sac that protects the testes. • Seminiferous tubule – tubes in the testes where sperm are produced. • Epididymis – where the sperm mature. • Vans deferens – tubes that carry the sperm from the testes to the penis. • Seminal vesicle, Prostate, and Cowper’s gland – They alladd to the seminal fluid to help the sperm survive better. They provide a fluid for the sperm to swim in, sugar to feed the sperm, and protect the sperm from the acidic vaginal tract. • Urethra – In the male it carries the urine and sperm. Never at the same time. • Penis – The organ that enters the female when erect and ejaculates the semen (sperm and fluid) into the female.

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