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7B REPRODUCTION

7B REPRODUCTION. Flowers. Why do plants produce flowers ? Which are the male parts of a flower ? Which are the female parts ?. P. A flower. S. A. S. O. O. Complete the diagram and glue it in your book. Fertilisation. What is the male plant sex cell ?

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7B REPRODUCTION

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  1. 7B REPRODUCTION

  2. Flowers • Why do plants produce flowers? • Which are themaleparts of a flower? • Which are thefemaleparts?

  3. P A flower S A S O O

  4. Complete thediagram and glueit in yourbook

  5. Fertilisation • Whatisthemaleplant sex cell? • Whatisthefemaleplant sex cell? • Whatisfertilisation? • Wheredoesfertilisationhappen in a flower?

  6. http://youtu.be/PKyC2GZd2dE • http://youtu.be/pVhH2GPlckE

  7. Human sex cells • Whatisthemale sex cell? • Whatisthefemale sex cell? • Wheredoesfertilisationhappen in humans?

  8. Look at thepicture of thesperm and eggcells and try to describe howitisspecialised

  9. Fertilisation • http://youtu.be/gU9kGLQ1-t8

  10. Thehumanreproductivesystem • Where are eggcellsmade? • Where are spermcellsmade?

  11. Human life cycle • What are the two words used to describe the “baby” growing in the mother’s uterus? • What are the 4 stages of the human life?

  12. Puberty/Adolescence • What physical changes happen to boys during puberty? • What physical changes happen to girls? • What chemicals cause these changes?

  13. L4 To know the changes that take place in boys and girls L5 To be able to explain why these changes happen. L6 To be able to give advice based on scientific understanding.

  14. http://www.bbc.co.uk/bitesize/ks3/science/organisms_behaviour_health/reproduction/activity/http://www.bbc.co.uk/bitesize/ks3/science/organisms_behaviour_health/reproduction/activity/ • SCIENTIFIC EYE VIDEO

  15. Changes in puberty Beard Moustache Voice Chest Penis Testes (testicles) Breast Hip General words: Armpit, hair, pubichair, sweat, muscle, period, grow

  16. Whataboutemotionalchanges?

  17. Definition of a hormone A chemical substance produced in the body that controls and regulates the activity of certain cells or organs.

  18. Level 5 Achieved? L5 To be able to explain why these changes happen.

  19. Puberty Hormones Male Brain/Hypothalamus Female Hormone Brain/Pituitary Gland Pituitary hormones FSH, Pituitary Hormones Testes Ovaries Testosterone Oestrogen, Progesterone, Testosterone Secondary sexual characteristics Menstruation

  20. Dear …….. I have read about Oestrogen Progesterone Testosterone FSH on the internet. What is it? How does it affect my body? Emily / Toby aged 13 years.

  21. Activity Problem Page - letter Discuss in your group how this may be helped and what it is caused by. Write a paragraph offering good advice and tips to the person.

  22. Tell us what you wrote. Was this answer Level 6? L6 To be able to give advice based on scientific understanding. How could we improve it?

  23. The menstrual cycle • How long does the average menstrual cycle last? • What happens in days 1-7? • What happens on day 14?

  24. Animations and videos • http://course.zju.edu.cn/532/study/theory/2/Genital%20system/Menstrual%20cycle.swf • http://youtu.be/ZvPVyas68jE

  25. Pregnancy • What is the gestation period? • How long is the gestation period in humans? • How does the developing foetus get the nutrients it needs? • What protects the foetus?

  26. Foetaldevelopment • http://youtu.be/AJIKe9eJLh4 • http://www.thevisualmd.com/videos/result/from_a_cell_to_a_baby

  27. Development of the foetus Y7

  28. Fertilization, the joining of the sperm and the egg in the fallopian tube (below) to form a unique human being, occurs. 

  29. This is a fertilized egg only thirty hours after conception.  Magnified here, it is no larger than the head of a pin.  Still rapidly dividing, the developing embryo, called a zygote at this stage, floats down from the fallopian tube and towards the uterus.

  30. WEEK 3-5 The embryo’s tiny heart begins to beat by day twenty-one.  Arm and leg buds are visible and the formation of the eyes, lips, and nose has begun.  The spinal cord grows faster than the rest of the body giving a tail like appearance which disappears as the embryo continues to grow.  The placenta begins to provide nourishment for the embryo.   

  31. WEEK 7 Major organs have all begun to form.  The embryo has developed its own blood type, unique from the mother’s.  Hair follicles and knees and elbows are visible.  Facial features are also observable.  The eyes have a retina and lens.  The major muscle system is developed and the embryo is able to move.  

  32. WEEK 8-12 The embryo is reactive to its environment inside the amniotic sac where it swims and moves.  Hands and feet can be seen.  At the end of week 8, the embryonic period is over and the foetal stage begins. 

  33. Weeks 13-16 The brain is fully developed and the foetus can suck, swallow, and make irregular breathing sounds.  Foetus can feel pain.  Foetal skin is almost transparent.  Muscles tissue is lengthening and bones are becoming harder.    Liver and organs produce appropriate fluids.  Eyebrows and eyelashes appear and the fetus makes active movements including kicks and even somersaults. 

  34. Week 20-24 A protective waxy substance called Vernix covers the skin.  By birth, most of the vernix will be gone but any that is left is quickly absorbed.  Foetus has a hand and  footprints and fingerprints are forming.  Foetus practices breathing by inhaling amniotic fluid into its developing lungs. 

  35. Weeks 25 – 28 Rapid brain development occurs during this period and the nervous system is able to control some bodily functions.  The foetus’ eyelids now open and close.  At 25 weeks there is a 60% chance of survival if born.      Weeks 29 – 32 There is a rapid increase in the amount of body fat the foetus has. Rhythmic breathing occurs, but the lungs are not yet mature.  The foetus sleeps 90-95% of the day.  At this point there the survival rate is above 95% if the baby is born.    

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