Menstrual cycle:A menstrual cycle is started by _____ which stimulates the maturation of a follicle in the ovary. The follicular cells surrounding the developing oocyte secrete ______ which is responsible for maintaining secondary sexual characteristics as well as thickening of the uterine lining. Ovulation is then triggered mid cycle by a surge in _______. Following ovulation, follicular cells turn into glandular corpus luteum that secretes increasing amounts of _____ & _______. If pregnancy does not occur, the corpus luteum degenerates, hormone levels ______, and the uterine lining disintegrates and is shed.

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