NEET 2009 Biology question

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

(1)maintenance of the hypertrophical endometrial lining
(2)maintenance of high concentration of sex hormones in the blood stream
(3)retention of well-developed corpus luteum
(4)fertilisation of the ovumCorrect

Answer: (4)

Solution

Menstruation occurs when the corpus luteum degenerates and progesterone level falls, so that the endometrium breaks down. If the ovum is fertilised, it implants and the placenta (together with the corpus luteum of pregnancy) maintains high levels of progesterone and oestrogen, so

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Question ID VK-090263