The female menstrual cycle begins at puberty and continues until menopause. During a cycle a follicle begins to mature under the control of follicle stimulating hormone secreted by the anterior pituitary gland.
As the follicle matures, it secretes estrogen and progesterone.
Both work to enlarge the endometrium and supply it with blood vessels to make it ready for potential implantation of a fertilized oocyte.
A mature follicle is called Graafian Follicle.
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