Question roughly speaking menstrual cycle?

why does the uterine lining disitegrates at the extension of the menstrual cycle? During the month the uterus prepares for a baby and grows this wall explicitly the best for implantation and growing. When the woman does not get pregnant the uterus sheds this inside layer and then you enjoy your period. It's only the lining of your uterus shedding. Then it starts to grow another pool liner.
peace
While I do not know for sure, it has to do near the tissue normally shed monthly contained by response to the hormonal changes of the menstrual spell.
Basically, your body told it to happen.
it happen in response to falling progesterone level in the blood.
The uterus is getting rid of the pool liner since pregnancy did not occur. That approach, the uterus can start fresh and prepare a new bin liner for a possible pregnancy with the subsequent ovulation.