The Menstrual Cycle

This lesson covers the hormonal control of the menstrual cycle — a critical topic in Edexcel GCSE Biology (1BI0) Topic 7. You must understand the roles of FSH, LH, oestrogen, and progesterone, how they interact, and how the cycle repeats approximately every 28 days.

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Overview of the Menstrual Cycle

The menstrual cycle is a recurring process lasting approximately 28 days that prepares the female body for pregnancy. It involves the maturation and release of an egg, and the build-up and shedding of the uterus lining (endometrium).

The cycle is controlled by four key hormones working together in a carefully coordinated sequence.

The Four Key Hormones