Key term for Edexcel GCSE Biology, used in Hormonal Coordination.
The process of shedding the broken-down uterus lining through the vagina, marking Day 1 of the cycle.
Menstruation appears in Edexcel GCSE Biology revision content for Animal Coordination, Control and Homeostasis, especially Hormonal Coordination and Hormonal Interaction in Menstrual Cycle.
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