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Hormones and the menstrual cycle

Hormones and the menstrual cycle. L.o : To explain the role of hormones in the menstrual cycle To explain how contraceptive pills work Starter: Discuss with your partner the changes that occur during puberty in boys and girls. S tarter:.

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Hormones and the menstrual cycle

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  1. Hormones and the menstrual cycle L.o: • To explain the role of hormones in the menstrual cycle • To explain how contraceptive pills work • Starter: Discuss with your partner the changes that occur during puberty in boys and girls

  2. Starter: • Discuss with your partner the changes that occur during puberty in boys and girls • What hormones are involved? • Suggest why are these changes important? Tosteestrone Insiuln rogenOest HL erProongeste

  3. Pre-starter: Hormones v nervous system Tosteestrone Insiuln rogenOest HL erProongeste Below are some scrambled hormones to help you. 2. As you watch the video try to identify how hormonal control is different and similar to control by the nervous system http://www.bbc.co.uk/learningzone/clips/hormones-and-puberty/1839.html

  4. L4- Hormones and the menstrual cycle • I can explain how these hormones interact (B) • I can suggest how this information can be used to develop contraceptives (A-A*) • I can describe of the role of each hormone in fertility(C) • Pathway to success: Key words: ovulation, ovaries, pituitary gland, period, progesterone, oestrogen FSH, LH

  5. Managing change Hormones are chemicals that act like messengers. They are secreted by glands and carried in the blood from organ to organ. hormone ovary hormone memo To: cells From: ovary Start puberty now! Cells in different parts of the body recognizethe hormones and respond by making changes.

  6. Glands and their hormones Where are the major glands of the body? pituitary gland thyroid pancreas adrenal glands ovaries (females) testes (males)

  7. Sex hormones In males, the testes produce the sex hormone testosterone, which makes male secondary sexual characteristics develop. ovaries (females) testes (males) In females, the ovaries produce the sex hormones oestrogen and progesterone. These make female secondary sexual characteristics develop and are involved in fertility and the menstrual cycle.

  8. The pituitary gland The pituitary gland is a pea-sized gland at the base of the brain.It releases many hormones and controls several other glands in the body. pituitary gland The pituitary gland produces two hormones involved in fertility: • follicle stimulating hormone (FSH) • luteinizing hormone (LH).

  9. True or false?

  10. The menstrual cycle?

  11. Inside the ovary What happens in the ovary during the menstrual cycle? Day 15-28:empty follicle turns into corpus luteum (yellow body) immature eggs Day 1-13: egg developing inside the growing follicle Day 14:ovulation – egg released from follicle

  12. period uterus liningthickness days after start of period 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Uterus lining The lining of the uterus becomes thicker with blood vessels and more stable during the menstrual cycle. Why is this important? A fertilized egg will bury itself (implant) in the uterus lining. The egg needs a plentiful supply of oxygen and nutrients to develop.

  13. Hormone levels

  14. Pregnancy If the egg is fertilized, the uterus lining must not break down otherwise the fertilized egg will not develop. progesterone memo To: uterus From: corpus luteum Maintain uterus lining. egg fertilized: uterus lining maintained, egg implanted oestrogen memo To: pituitary From: corpus luteum Don’t send FSH. corpus luteum: continues to produce progesterone and oestrogen

  15. Check point: Hormonal control or nervous control? Nervous • Acts very quickly • Long lasting response • Chemical messenger carried in the blood • Electrical impulse carries the message • Chemical messenger diffuses across a synapse • Chemicals made and released by glands • Co-ordinate a response by the body Hormonal Hormonal Nervous Nervous Hormonal Nervous and Hormonal

  16. L4- Hormones and the menstrual cycle • I can explain how these hormones interact (B) • I can suggest how this information can be used to develop contraceptives (A) • I can describe of the role of each hormone in fertility(C) • Pathway to success: Key words: ovulation, ovaries, pituitary gland, period, progesterone, oestrogen FSH, LH • TASK: • Menstrual cycle • What is it? • How often does it happen? • What chemicals causes these changes to happen, and where are they made and released? • What is the role of the following hormones: Oestrogen, FSH, LH and progesterone?

  17. How do the hormones in the menstrual cycle coordinate a period? • Make a story board to explain the role of the hormones in the menstrual cycle

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