Form 3 Science Chapter 4 Reproduction 2

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Form 3 Science Chapter 4 Reproduction 2

  1. 1. Lesson 2Human reproductive system
  2. 2.  All living things reproduce. Reproduction may be SEXUAL or ASEXUAL.
  3. 3.  For continuity of life Increase the number of individuals of the same species Replaces those that die
  4. 4. Production of individuals with gametes
  5. 5. Sexual Reproduction Asexual reproduction Male & Female parents One parent Gametes involved No gamete
  6. 6. Sexual reproduction Asexual reproduction Male & Female parents One parent Gametes involved No gamete Fertilization occurs No fertilization
  7. 7. Sexual Reproduction Asexual reproduction Male & Female parents One parent Gametes involved No gamete Fertilization occurs No fertilization Genes from both Gene from one parents parent Mixture 100% identical to characteristics parent
  8. 8. Sexual AsexualReproduction reproduction Male & Female parents One parent Gametes involved No gamete Fertilization occurs No fertilization Genes from Gene from one both parents parent Mixture 100% identical to characteristics parent Variation No variation
  9. 9. Sexual AsexualReproduction reproduction Male & Female parents One parent Gametes involved No gamete Fertilization occurs No fertilization Genes from Gene from one both parents parent Mixture 100% identical to characteristics parent Variation No variation
  10. 10. Gamete: Sperm Gamete: Ovum*Gonad – testes *Gonad – ovary*Many sperm cells *One egg cell a month*Smaller *Larger than a body cell*Swims through liquid *Cannot move on its own*Head, middle, & tail *Round shape
  11. 11.  Reproductive system functions in gamete  Production  Storage  Nourishment  Transport Fertilization  Fusion of male and female gametes to form a zygote
  12. 12.  Parts of Male reproductive system Parts of Female reproductive system Direction of sperm movement until fertilization occurs
  13. 13. Figure 28.1
  14. 14. Figure 28.3
  15. 15.  Functions  Toproduce, maintain and transport sperm (the male reproductive cells) and protective fluid (semen)
  16. 16.  Functions  Toproduce, maintain and transport sperm (the male reproductive cells) and protective fluid (semen)  Toproduce and secrete male sex hormones (testosterone) responsible for maintaining the male reproductive system
  17. 17. http://www.uh.edu/~tgill2/image010.jpg
  18. 18. Mix with fluid and mucus(semen)Typical ejaculate = 2-5 ml Contains between 20 – 100 million sperms per ml
  19. 19.  Testes / testicles (Gonads)  Produce sperm (Spermatogenesis)  Sperm production begins at puberty and continues throughout the life of a male
  20. 20.  Testes / testicles (Gonads)  Produce testosterone  Hair patterns and voice changes  Development of the male accessory organs (prostate, seminal vesicles etc.)  Stimulates the effect of protein building in the body that is responsible for the greater muscle development and strength of the male
  21. 21.  Duct System  Epididymis  Sperm mature in epididymis  Vas Deferens  Transports mature sperm to the urethra  Ejaculatory ducts  empty into the urethra
  22. 22.  Seminal vesicles  Attached to vas deferens  Produce a sugar- rich fluid (fructose) that provides energy to sperm
  23. 23.  Prostate Gland  Makes fluid and mucus
  24. 24.  Urethra  Tube that carries urine from the bladder to outside of the body  Also carries semen out of the body
  25. 25.  Functions  Produces the female egg cells - ovum  Transports the eggs to the site of fertilization  The fertilization of an egg by a sperm, occurs in the Fallopian tubes
  26. 26. Figure 28.13
  27. 27. Functions Place for a baby to develop Iffertilization does not take place, the system is designed to menstruate Produces female sex hormones that maintain the reproductive cycle.
  28. 28.  Pathway of ovum to uterus Fertilization occurs here Thefertilized egg then moves to the uterus for development http://www.ricancercouncil.org/img/cervical.gif
  29. 29.  Protection Nutritional support for fetus Waste removal for the developing embryo and fetus
  30. 30.  Lower part of uterusAllows sperm to enter uterusFor menstrual blood to exitConnects to vagina
  31. 31.  Canal that joins the cervix (the lower part of uterus) to the outside of the body Birth canal Allow penis to enter

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