Menstrual cycle (Edexcel GCSE Biology): Flashcards
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Menstrual cycle duration
Menstrual cycle duration
Approximately 28 days
Age range for menstrual cycles
Age range for menstrual cycles
Puberty (~age 12) to menopause (~age 50)
Purpose of menstrual cycle
Purpose of menstrual cycle
Prepare uterus for potential pregnancy
4 key hormones in menstrual cycle
4 key hormones in menstrual cycle
Oestrogen, progesterone, FSH, LH
What happens days 1-5?
What happens days 1-5?
Menstruation - uterus lining breaks down
Hormone levels during menstruation
Hormone levels during menstruation
Oestrogen and progesterone are low
Duration of menstruation
Duration of menstruation
3-7 days
Role of oestrogen
Role of oestrogen
Repairs and thickens uterus lining after menstruation
Where is oestrogen produced?
Where is oestrogen produced?
Ovaries
What happens on day 14?
What happens on day 14?
Ovulation - release of mature egg
What triggers ovulation?
What triggers ovulation?
LH surge
Role of progesterone
Role of progesterone
Maintains thickened uterus lining
Where is progesterone produced?
Where is progesterone produced?
Corpus luteum
Role of FSH
Role of FSH
Stimulates egg maturation and oestrogen production
Where are FSH and LH produced?
Where are FSH and LH produced?
Pituitary gland