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FSH and LH are produced by the pituitary gland; estrogen and progestin are produced by the ovary; FSH stimulates the ovary to promote development of a follicle; The developing follicles secrete estrogen, which inhibits FSH (negative feedback); Estrogen stimulates growth of endometrium; Estrogen stimulates LH secretion (positive feedback); LH stimulates follicle growth and triggers ovulation;(the secondary oocyte leaves the ovary and) follicle becomes corpus luteum; The corpus luteum secretes estrogen and progesterone; Estrogen and progesterone maintain the endometrium; Estrogen and progesterone inhibit LH and FSH (negative feedback); After (two weeks) the corpus luteum degenerates progesterone and estrogen levels fall; This triggers menstrual bleeding, the loss of endometrium; The pituitary gland secreted FSH and LH, as they are no longer inhibited (and the menstrual cycle continues);

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