Se ha denunciado esta presentación.
Utilizamos tu perfil de LinkedIn y tus datos de actividad para personalizar los anuncios y mostrarte publicidad más relevante. Puedes cambiar tus preferencias de publicidad en cualquier momento.

Form 3 Science Chapter 4 Reproductive System and fertilisation

  • Sé el primero en comentar

Form 3 Science Chapter 4 Reproductive System and fertilisation

  1. 1. REPRODUCTIONReproductive Parts and Fertilisation
  2. 2. QUESTIONS How do you think a baby is formed? What do you think are the important things both parents will pass on to their child during the formation of a baby?
  3. 3. REPRODUCTION IN HUMANS Well, before a human can reproduction sexually, How does sexual the body certain organs in reproduction must develop and occur in mature. humans?
  4. 4. REPRODUCTIVE SYSTEM Which part of the human body are involved in sexual reproduction?
  5. 5. MALE SEX ORGAN In the male, the male sex organ plays an important role in sexual reproduction. The testes produce millions of sperms which can only be seen under a microscope. penis testes parts of the male sex organ © 2009 Marshall Cavendish International (Singapore) Private Limited
  6. 6. REPRODUCTIVE SYSTEM - MALE
  7. 7. THE RIBENA ANALOGY In animals, the male gametes are known as  sperms The female gametes are known as  ova  ovum  eggs
  8. 8. HUMAN SPERMContains mitochondriawhich provides energyfor the sperm’s activity 8Enables the sperm toswim towards egg
  9. 9. FEMALE SEX ORGAN• In the female, the female sex organ plays an important role in sexual womb reproduction.• The ovaries produce eggs.• Usually, only one egg is released from the ovary ovaries vagina each month. parts of the female sex organ © 2009 Marshall Cavendish International (Singapore) Private Limited
  10. 10. REPRODUCTIVE SYSTEM – FEMALE
  11. 11. HUMAN EGG 11
  12. 12. HOW DOES HUMAN LIFE BEGIN? The sperms in the testes of a male are transferred through the penis into the female’s vagina. The sperms find their way to meet the egg inside the female’s body. If a sperm meets an egg, they fuse. This is known as fertilisation. Only one sperm can fertilise the egg. The male and female are now the father and mother of the fertilised egg. + sperm egg fertilised egg © 2009 Marshall Cavendish International (Singapore) Private Limited
  13. 13. OVULATION >> FERTILIZATION >>IMPLANTATION
  14. 14. HOW DOES HUMAN LIFE BEGIN?  The fertilised egg divides to form more and more cells.  These cells will eventually form the organs in the body of the developing baby.fertilised egg many cells developing baby © 2009 Marshall Cavendish International (Singapore) Private Limited
  15. 15. HOW DOES FERTILIZATION OCCUR?1. There is mating2. Sperms are introduced into the female through the vagina.3. The sperms swim through the uterus to the oviduct towards the egg.4. A sperm bumps into the egg.5. The sperm penetrates the egg membrane.6. The tail drops.7. The egg membrane thickens to prevent other sperms from entering.8. The sperm nucleus fuses with the egg nucleus.
  16. 16. HOW DOES HUMAN LIFE BEGIN? As the baby develops inside the mother’s womb, the mother’s belly gets bigger. After about 9 months, the baby is born.umbilical cord newborn baby © 2009 Marshall Cavendish International (Singapore) Private Limited
  17. 17. PARENTS AND THEIR YOUNG The fusion of the sperm and egg results in a fully developed baby. These two reproductive cells contain information about the characteristics of the father and the mother. Through the reproductive cells, the characteristics of the parents are passed on to their young. Thus, the characteristics of plants and animals are preserved in future generations, hence ensuring that their kind continues to exist. © 2009 Marshall Cavendish International (Singapore) Private Limited
  18. 18. PUBERTY
  19. 19. HOW DOES IT HAPPEN? Puberty - specific changes in the male  Boys usually reach puberty at an average age of 13 years.  Sex organ starts to produce sperms  Shoulder and chest become broader  Voice breaks and deepens  Moustache and beard start to grow
  20. 20. HOW DOES IT HAPPEN? Puberty - Specific changes in the female  When a baby girl is born, the ovaries already contain around 400 000 ova or eggs.  Girls tend to mature two years earlier than boys (average age of 11)  When she matures, a small fraction of these eggs mature (approx. 450) and is released from alternate ovaries each month.  Breasts develop  Hips widen  Undergoes the menstrual cycle
  21. 21. PERIOD – START OFPUBERTY  It is a cycle that all mature girls go through.  One cycle takes approximately 28 days.  Menstruation >> Repair >> Ovulation >> Prepare for Implantation.
  22. 22. SANITARY PADS
  23. 23. THE UTERUS
  24. 24. THE UTERINE WALL
  25. 25. FACTS ABOUT MENSTRUAL CYCLE What is the mean duration of the MC?  Mean 28 days (only 15% of ♀)  Range 21-35 What is the average duration of menses?  3-8 days What is the normal estimated blood loss?  Approximately 30 ml
  26. 26. MENSTRUAL CYCLE
  27. 27. PHASES IN MENSTRUAL CYCLE 1)Menstrual phase 2)Repair phase 3)Fertile phase 4)Premenstrual phase
  28. 28. MENSTRUAL PROBLEMSPremenstrual Syndrome (PMS)No Period
  29. 29. TREATING MENSTRUAL PROBLEMSMedicationExerciseProper Diet

×