IB Biology SL 2.4.7.5 Menstrual-cycle hormones Question Bank
Practise IB Biology SL 2.4.7.5 by explaining how hormones coordinate ovulation and endometrial changes.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Identify roles of FSH, LH, oestrogen and progesterone in the menstrual cycle.
- Explain negative feedback and hormone changes around ovulation and menstruation.
D3.1.5—Ovarian and uterine cycles question 1
[Maximum number: 8]
Outline the role of hormones in the menstrual cycle.
FSH (released from pituitary) stimulates follicle growth (in ovary); oocytes/egg cells mature;
cells of growing follicle produce estrogen; estrogen signals endometrium/lining of uterus to thicken;
causes final maturation of follicle; high levels of estrogen stimulate secretion of LH;
LH spike stimulates ovulation/follicle ruptures releasing oocyte/ova/egg cells;
LH stimulates follicle (left behind in ovary) to develop into corpus luteum;
LH stimulates corpus luteum to secrete progesterone/estrogen; progesterone/estrogen stimulates continued development/maintenance of lining of uterus (in preparation for implantation of embryo);
if no pregnancy then corpus luteum disintegrates;
drop in progesterone/estrogen hormone levels causes breakdown in uterine lining/menstruation; progesterone/estrogen inhibit FSH/LH release;
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