A menstrual flow results from _____.

A. the implantation of a fertilized ovum in the endometrium
B. adecrease in progesterone and estrogen levels
C. the release of gonadotropin-releasing hormone by the hypothalamus 
D. the production of prostaglandins by the uterus
E. the release of progesterone and estrogen by the corpus luteum


Answer: B

Nutritional Science

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