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Menstrual cycle of women runs in a 28-day cycle. In the first 2 weeks of the said cylcle, the pituitary gland releases a hormone called Follicle Stimulating Hormone or FSH which comes from the  adenohypophysis ot the anterior lobe of the pituitary lobe. FSH stimulates the follicle of the ovary to grow and activates the follicle cells to secrete estrogen.  On the 14th day the hormones from FSH switches to Luteinizing Hormone which stimulates ovulation that causes the egg to pop out of the ovarian follicle.