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Based on the provided graph, which depicts the changes in the thickening of the uterine wall for two women labeled as X and Y over a one-month period, what conclusion can be drawn from this data?
Woman Y is undergoing menopause
Woman X has conceived
Both women X and Y will undergo menarche in the next month
Both A and B
Answers (1)
In the absence of fertilization after ovulation, which typically occurs around the 14th day of the menstrual cycle, the uterine lining is shed as menses during a 28-day cycle. However, if the egg is fertilized, the uterine lining undergoes growth to support the development of the embryo. Based on the provided diagram, it can be observed that the uterine wall thickness of woman Y begins to decrease after the 14th day. This indicates that the egg has not been fertilized, and she is experiencing the shedding of the uterine lining as part of her menstrual cycle. On the other hand, the uterine wall thickness of woman X shows an increase in thickness. This suggests that the egg has been fertilized, and she has conceived. The growth of the uterine lining is occurring to support the development of the embryo. Therefore, the rephrased conclusion is that woman Y's uterine wall thickness decreases after the 14th day, indicating non-fertilization of the egg, while woman X's uterine wall thickness increases, indicating successful fertilization and conception.
Hence, the correct answer is option 2.
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