Menstrual cycle (Edexcel GCSE Biology Combined Science): Flashcards
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Menstrual cycle duration
Menstrual cycle duration
Approx. 28 days
Days 1-5 of cycle
Days 1-5 of cycle
Menstruation - lining breaks down
Hormone levels during menstruation
Hormone levels during menstruation
Oestrogen & progesterone low
Oestrogen's role in cycle
Oestrogen's role in cycle
Repairs & thickens uterus lining
Day of ovulation
Day of ovulation
Around day 14
Most fertile phase of cycle
Most fertile phase of cycle
Day 14 - ovulation
Progesterone's role in cycle
Progesterone's role in cycle
Maintains thickened uterus lining
Source of FSH
Source of FSH
Pituitary gland
Function of LH surge
Function of LH surge
Triggers ovulation (egg release)
If no fertilisation occurs
If no fertilisation occurs
Progesterone drops, menstruation starts