Seminal vesicles and prostate: add sperm fluid to the sperm cells
Semen = sperm fluid with sperm cells
Slide 6 - Slide
Fertility in girls
Approx. 400,000 oocytes present from birth.
Egg cells begin to mature at puberty.
Slide 7 - Slide
Slide 8 - Slide
Menstruatiecyclus
(28 dagen)
An egg matures in one of the ovaries
The uterine lining thickens
Ovulation = release of an egg from an ovary.
Period
Follicle = vesicle surrounding an egg
Slide 9 - Slide
Slide 10 - Slide
Oestrogen has three effects:
prevents other egg cells from maturing
the uterine lining starts to thicken
if there is a lot of oestrogen present within the blood (the first peak in the graph of figure 10) the pituitary gland gives a signal to start ovulation.
Progesterone stimulates further growth and saturation of the uterine lining
Slide 11 - Slide
1. The pituitary gland releases FSH. FSH stimulates the growth of the ovarian follicle.
Slide 12 - Slide
2. Growing follicle mainly produces estrogen before ovulation.
- inhibits the production of FSH, preventing new cells from maturing.
Slide 13 - Slide
3. Due to a lot of estrogen in the blood, the pituitary gland starts to produce LH (luteinizing hormone).The ovulation occurs.
Slide 14 - Slide
4. After ovulation: LH ensures the growth of the empty follicle (corpus luteum).
Slide 15 - Slide
5. The corpus luteum produces progesterone.
- inhibits the production of FSH and LH
- egg cells do not mature, ovulation does not occur.
Slide 16 - Slide
6. Egg not fertilized: production of estrogen and progesterone decreases. Uterine lining breaks down (menstruation).
Slide 17 - Slide
Slide 18 - Slide
What?
Make: 11.1 assignments 4, 7, 8,16-18, 20, 22, 24
How?
In your (online) book. Choose: whispering or listening to music on your laptop. Make worksheet assignments in your notebook.
Help?
Raise your hand. If he/she is not listening to music, you may ask your neighbour first.
