Biology-Menstrual Cycle& Hormones


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What happens in stage 1 of the mentstrual cycle?
Bleeding starts. Menstruation.
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What is menstruation?
when the uturus lining breaks down and is released.
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What happens in stage 2 on the menstrual cycle?
Lining of the uturus builds up again. Day 4-14. blood vessels are ready to recieve a fertalised egg.
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What happens in stage 3 of the menstrual cycle?
Egg is released. about dat 14
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What happens in stage 4 of the menstrual cycle?
Lining is maintained day 14-28. If no fertalised egg has landed then the lining will break down meaning the cycle starts over again.
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What are the 4 hormones involved in the Menstrual Cycle?
1. FSH 2. Oestrogen 3. LH 4. Progresterone
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What roles does FSH play?
causes a follicle to mature in one of the the ovaries. Stimulated oestrogen production.
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What role does oestrogen play?
Causes the lining of the uturus to thicken. A high level stimulates LH.
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What role does LH play?
Simulates ovulation. Egg is released. Stimulates the remains of the follicle to develop into a structure called a corpus luteum- which secretes progestrone.
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What role does progresterone play?
maintains the lining of the uturus. Inhibits production of FSH and LH. When level of progresterone and pestrogen falls, the uturus lining breaks down. Allows the cycle to start again.
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What controls the level of hormones?
Negative Feedback
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What is the order in which hormones are released in the menstrual cycle?
1. pitutary gland 2. FSH 3. Ovary 4. Oestrogen
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What are the 4 fertilaty treatments avaliable?
1. Hormones 2. IVF 3. Donated Eggs 4. Surrogate Mother
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How is IVF carried out?
Collecting eggs from the womans ovaries and fertialising them in a lab. They then grow into embryos. is then put back in the womb for pregnancy.
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How does hormone treatment help with fertlity?
when the woman doesnt produce enough FSH so the eggs do not mature. Injecting LH and FSH can stimulate egg release.
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Other cards in this set

Card 2

Front

What is menstruation?

Back

when the uturus lining breaks down and is released.

Card 3

Front

What happens in stage 2 on the menstrual cycle?

Back

Preview of the front of card 3

Card 4

Front

What happens in stage 3 of the menstrual cycle?

Back

Preview of the front of card 4

Card 5

Front

What happens in stage 4 of the menstrual cycle?

Back

Preview of the front of card 5
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