The Menstrual Cycle L.O: To know how hormones are used to control the menstrual cycle.
Hormones and the menstrual cycle
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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
description
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:. - PowerPoint PPT Presentation
Transcript of 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
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?
Insiuln
HL
TosteestronerogenOest
erProongeste
Pre-starter: Hormones v nervous systemBelow are some scrambled hormones to help you.
http://www.bbc.co.uk/learningzone/clips/hormones-and-puberty/1839.html
2. As you watch the video try to identify how hormonal control is different and similar to control by the nervous system
Insiuln
HL
TosteestronerogenOest
erProongeste
L4- Hormones and the menstrual cycle• Pathway to success:
•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)
•I can explain how these hormones interact (B)
Key words: ovulation, ovaries, pituitary gland, period, progesterone, oestrogen FSH, LH
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Managing change
Cells in different parts of the body recognize the hormones and respond by making changes.
hormone memoTo: cellsFrom: ovaryStart puberty now!
ovary
hormone
Hormones are chemicals that act like messengers. They are secreted by glands and carried in the blood from organ to organ.
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Glands and their hormones
Where are the major glands of the body?
thyroid
adrenal glands
testes (males)
pituitary gland
pancreas
ovaries (females)
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Sex hormones
In males, the testes produce the sex hormone testosterone, which makes male secondary sexual characteristics develop.
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.
testes (males)
ovaries (females)
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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.
The pituitary gland produces two hormones involved in fertility:
follicle stimulating hormone (FSH) luteinizing hormone (LH).
pituitary gland
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True or false?
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The menstrual cycle?
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Inside the ovary
What happens in the ovary during the menstrual cycle?
Day 1-13:egg developing inside the growing follicle
Day 14:ovulation – egg released from follicle
Day 15-28:empty follicle turns into corpus luteum (yellow body)
immature eggs
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Uterus lining
The lining of the uterus becomes thicker with blood vessels and more stable during the menstrual cycle. Why is this important?
2 106 84 12 14 16 18 20 22 24 26 28days after start of period
uter
us li
ning
thic
knes
s
period
A fertilized egg will bury itself (implant) in the uterus lining. The egg needs a plentiful supply of oxygen and nutrients to develop.
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Hormone levels
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Pregnancy
If the egg is fertilized, the uterus lining must not break down otherwise the fertilized egg will not develop.
corpus luteum: continues to produceprogesterone and oestrogen
egg fertilized:uterus lining maintained, egg implanted
progesterone memoTo: uterusFrom: corpus luteumMaintain uterus lining.
oestrogen memoTo: pituitaryFrom: corpus luteum
Don’t send FSH.
Check point: Hormonal control or nervous control?
• 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
Nervous
L4- Hormones and the menstrual cycle• Pathway to success:
•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)
•I can explain how these hormones interact (B)
Key words: ovulation, ovaries, pituitary gland, period, progesterone, oestrogen FSH, LH
TASK:1. Menstrual cycle
a. What is it?b. How often does it happen?c. What chemicals causes these changes to happen, and
where are they made and released?d. What is the role of the following hormones: Oestrogen,
FSH, LH and progesterone?
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
