The cycle begins with the release of ____ (GnRH) by the hypothalamus. GnRH stimulates the ____ to secrete Follicle stimulating hormone (FSH) and ____. Stimulates the development of the follicle to become / Graafian / matured follicle. The developing / growing follicles produce ____. There is a slow rise in estrogen secreted during the follicular phase. The low level of estrogen keeps ____. Secretion of estrogen by the growing follicle rises / increase sharply. The high estrogen stimulates the ____. GnRH stimulates the anterior pituitary gland to secrete high level of LH (and FSH) LH stimulates ____. After ovulation / during the luteal phase LH stimulates the ____ of the secondary / Graafian / matured follicle into ____// LH stimulates the development of corpus luteum. Under continued ____, the corpus luteum secretes ____ and estrogen. As level of these hormones rises, they exert a ____ on the hypothalamus, inhibiting the secretion of ____. Near the end of luteal phase, / If fertilization does not occur, the corpus luteum ____/ disintegrates / regress causing the level of estrogen and progesterone to ____. This causes the ____/ sloughing off of endometrium, ____ occurs. The pituitary gland begins to secrete enough FSH to stimulate the growth of new follicle in the ovary.

Describe the hormonal control during ovarian cycle.

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