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Unformatted text preview: , under the direction of LH, the remaining follicular cells develop into a corpus luteum . The corpus luteum begins to secrete progesterone, which continues the development of the uterus . If fertilization and implantation does occur, the implanted zygote secretes human chorionic gonadotropin , which signals to the corpus luteum in the ovary to continue to secrete estrogen and progesterone throughout the first trimester of pregnancy. In the absence of this signal, the ovary enters the premenstrual phase and the corpus luteum degrades into a corpus albicans . The decreased secretion of progesterone from the corpus luteum results in atrophy of the endometrial lining and menstruation....
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- Fall '10