GCSE Combined Science (AQA)

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Menstrual Cycle Graphs

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Homeostasis and Response Hormonal Coordination in Humans

Menstrual Cycle Graphs

2:32 Hormones and the Menstrual Cycle
Spec 4.5.3.4
Previous Interactions of Menstrual Hormones Next Hormonal Contraception
  • Hormone levels in the menstrual cycle can be graphically represented.
  • It's important to extract and interpret data from graphs of hormone levels for exams.
  • Memorizing the exact shape of the graph is not necessary.
  • The graph's X-axis represents days of the cycle (1 to 28), and the Y-axis shows hormone levels.
  • Hormones represented include FSH (blue dash line), estrogen (purple dash line), LH (green solid line), and progesterone (orange dash line).
  • Hormone levels increase in the order of FSH, estrogen, LH, and then progesterone.
  • The acronym FOLP can help remember the order: FSH, estrogen, LH, progesterone.
  • FSH increases first, causing a rise in estrogen levels.
  • Increased estrogen subsequently inhibits FSH, leading to a decrease in FSH levels.
  • Estrogen stimulates the release of LH, which peaks at day 14 to trigger ovulation.
  • Post-ovulation, progesterone levels increase towards the end of the cycle.

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