Reproductive system -The-menstrual-cycle .pptx

Reproductive system The-menstrual-cycle

1. Challenge: Identify the type of graph you would draw for continuous and discontinuous variation Explain how a sperm cell is adapted to its function Describe continuous variation, and give an example Describe what the reactivity series is Describe the role of bone marrow in the body LAST LESSON LAST WEEK LAST TOPIC LAST YEAR

2. Menstrual Cycle

3. Explain the events of the menstrual cycle and how the menstrual cycle links with pregnancy Fertilisation , Menstruation, Cycle, Hormone, Oestrogen , Progesterone, FSH, LH Define fertilisation Identify key events on a diagram of the menstrual cycle Explain why pregnancy is more or less likely at certain stages of the menstrual cycle

4. List all the changes that occur in males and females during puberty. Female Male

5. Fertilisation What is fertilization? Consider what the image above is showing you Why is it important? Fertilisation is when a sperm cell joins with an egg cell. It is important because this is how reproduction occurs in most living things including humans

6. The menstrual cycle What changes? Why does it change? What causes it to change?

7. The menstrual cycle is the body’s way of preparing for pregnancy. It only happens in females. It is controlled by chemicals called hormones.

8. Several  hormones  are involved in the  menstrual cycle of a woman: follicle stimulating hormone (FSH)  causes the maturation of an egg in the ovary. luteinising hormone (LH)  stimulates the release of the egg. oestrogen  is involved in repairing and thickening the uterus lining Progesterone maintains the uterus lining

9. FSH is secreted by the pituitary gland. It makes eggs mature and stimulates the ovary to produce oestrogen. Uterus lining breaks down - menstruation Lining of uterus builds up Lining maintained The level of oestrogen rises. This inhibits the production of more FSH and stimulates the build up of the lining of the uterus - proliferation LH is secreted by the pituitary gland. When its level reaches a peak it stimulates the release of a mature egg from the ovary - ovulation After the egg is released the level of progesterone rise and maintains the lining of the uterus in preparation for the implantation of the fertilised egg.

10. The Menstrual Cycle 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 The main events in the cycle are: 1) Menstruation – uterus lining breaks down, blood and cells are lost. 2) Proliferation – repair of the uterus lining. 3 ) Ovulation – release of an egg from the ovary – day 14 4 hormones involved: FSH Oestrogen LH Progesterone Cycle starts again

11. Label the key events on this menstrual cycle timeline State where in the menstrual cycle pregnancy is most likely to occur. Justify your answer Challenge: Apply knowledge of the menstrual cycle to graphs showing the hormones involved.

12. Todays Lesson Last Lesson Last Last Lesson Describe the process of menstruation Recall the key components of the female reproductive system Explain the importance of adaptations