Menstruation Cycle (IGCSE EDEXCEL BIOLODY CORE)

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Last updated 12:25 PM on 4/15/26
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17 Terms

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Menstrual cycle
28 day cycle where uterus lining builds up then sheds
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Day 1 to 5
menstruation occurs where the uterus lining is shed
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Day 1 to 13
egg matures and oestrogen rises and uterus lining repairs
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Day 14
ovulation occurs where the egg is released from the ovary
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Day 15 to 28
corpus luteum forms and progesterone rises and uterus lining is maintained
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Day 28
progesterone drops where the lining sheds and cycle restarts
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FSH
made by pituitary gland where it matures the egg and stimulates oestrogen production
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LH
made by pituitary gland where it triggers ovulation and stimulates progesterone production
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Oestrogen
made by ovaries where it repairs uterus lining and triggers LH surge and inhibits FSH
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Progesterone
made by corpus luteum where it maintains uterus lining and inhibits FSH and LH
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Corpus luteum
empty follicle after ovulation where it produces progesterone
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Negative feedback 1
high oestrogen inhibits FSH
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Negative feedback 2
high progesterone inhibits FSH and LH
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No fertilisation
corpus luteum breaks down where progesterone drops and period occurs
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Fertilisation
corpus luteum stays where progesterone stays high and lining is maintained
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Oestrogen peak
just before day 14 where it triggers the LH surge causing ovulation
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Progesterone peak
days 19 to 23 where it maintains the uterus lining