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A 28 day cycle in females. It is a repeating series of changes in the female’s uterine lining as it responds to the changing levels of oestrogen and progesterone. Diagram. Days 1-5: Menstruation (Period) Endometrium is shed. During the period of the menstruation (( 5 days) a new follicle develops in the ovary. FSH (produced in pituitary gland ... ................
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