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Which one of the following is the most likely root cause why menstruation

Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?

Options

(a) maintenance of the hypertrophical endometrial lining
(b) maintenance of high concentration of sex hormones in the blood stream
(c) retention of wall-developed corpus luteum
(d) fertilisation of the ovum

Correct Answer:

fertilisation of the ovum

Explanation:

Fertilization of ovum is the most likely root cause wh menstruation is not taking place in regularly cycling human female. In order for fertilization to occur, one of these sperm must attach itself to the ovum and penetrate its outer surface. The fertilized ovum will then continue travvelling down the fallopian tube, taking several days until it reaches the uterus. When it arrives, it attaches itself to the lining of the uterus and continues to grow. If the ovum is not fertilized it will die and the progest

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