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MALE REPRODUCTIVE SYSTEM

MALE REPRODUCTIVE SYSTEM. Mrs. Alexandra Mart ínez GCI Science Teacher. What ´s the role of males in sexual reproduction ?. The main goal of the MRS is to produce sperm cells and deliver them to the FRS to achive his main objective of FERTILIZATION!!.

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MALE REPRODUCTIVE SYSTEM

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  1. MALE REPRODUCTIVE SYSTEM Mrs. Alexandra Martínez GCI ScienceTeacher

  2. What´sthe role of males in sexual reproduction? • Themaingoal of the MRS isto produce spermcells and deliverthemtothe FRS toachivehismainobjective of FERTILIZATION!!

  3. MALE´S STRUCTURES & FUNCTIONS • Testes Eggshapedstructureslocatedoutsidethe abdominal cavity, outside of thebodyinsde a sackcalledSCROTUM. They are locatedoutsidetoensuretheoptimaltemperature of 34ºC forspermdevelopment. Testes iswheresperm and testosterone (importantmale hormone isproduced). Theycontainsmalltubulescalled SEMINIFEROUS TUBULES, where meiosis (spermatogenesis) occurs and spermcells are produced. • Epididymis Locatedjustaboveeachtesticle, consists of more tubules, wherespermgotomature and develop a tailtocapable of moving.

  4. MALE´S STRUCTURES & FUNCTIONS • Vas Deferens Tubes that connect the testes to the urethra, carrying sperm cell and other semen content. Urethra is the same duct through which urine leaves the male body. • Glands and Vesicles As the sperm advances to be ejected from the penis, it passes along other structures collecting fluids that will together form the SEMEN. SEMINAL VESICLE: secrets fructose to enrich the content of semen. PROSTATE GLAND: secrets an alkaline substance to neutralize vagina´s acidity. BULBOURETHRAL GLAND: secrets an alkaline substance to neutralize any acid left over in the urethra due to urine.

  5. MALE´S STRUCTURES & FUNCTIONS • Sperm´s Pathway: seminiferous tubules – epididymis – vas deferens – seminal vesicle – prostate gland – bulbourethral gland – urethra – penis.

  6. MALE´S STRUCTURES & FUNCTIONS • Semen Content Semen is the fluid that is ejected from the penis, carrying sperm to accomplish fertilization. • Sperm: male gamete carrying genetic info. • Protein: to provide a clogging substance avoiding the semen being too liquidly and fall out of the vagina. • Fructose: which is a carbohydrate to provide energy for the sperm to survive the long journey. • Alkaline solution: to neutralize vagina´s acidity and give sperm a less hostile environment so that it can survive.

  7. MALE´S STRUCTURES & FUNCTIONS • Sperm: • Head: Carriesthenucleuswithchromosomes. At thetipistheacrosome, whichcarryenzymestosoftentheegg´slayer. • Midpiece: Mitochondriawhichisthe motor responsibleformaintaininghighenergylevels. • Tail: actslike a propeller, designedforspeed and strength

  8. MALE´S STRUCTURES & FUNCTIONS • Hormones Several hormones important for the well functioning of the MRS • LH: stimulates the secretion of testosterone. • FSH: stimulates sperm production • Testosterone: stimulates sperm production. Begins to be produced during puberty. • Male infertility Some causes of male infertility • Showers in hot tubs, too hot showers, sauna. • No sperm movement • Not enough sperm in semen. Normal count is 300-400 million in 3.5ml.

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