The main cause of the disintegration of the endometrial lining?

LH surge

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Degeneration of corpus luteum

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Ovulation during mid-cycle

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Implantation leads to pregnancy

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Solution

The correct option is B Degeneration of corpus luteum

Main cause of the disintegration of the endometrium

In the absence of fertilisation, the corpus luteum degenerates and the level of progesterone hormone falls.

This causes disintegration of the endometrium leading to menstruation, marking a new cycle.

Final answer:

(b) Degeneration of corpus luteum

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