A) Maintenance of the hypertrophical endometrial lining.
B) Maintenance of high concentration of sex hormones in the blood stream.
C) Retention of well-developed corpus luteum.
D) Fertilisation of the ovum.
Correct Answer: D
Solution :
[d] Fertilisation of ovum is the most likely root cause for menstruation not taking place a regular cycling in human female. In order for fertilisation to occur, one of these sperm must attach itself to the ovum and penetrate its outer surface. The fertilised ovum will then continue travelling 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 fertilised, it will die and the levels of progesterone and oestrogen hormone will drop. Without these hormones, the prepared uterus lining breaks up and is released through the vagina. This is known as a 'period'.
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