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The uterine lining builds-up following ovulation in preparation for possible pregnancy, to allow the zygote to implant and nourish the growing 'baby'. If pregnancy doesn't occur the drop in progesterone triggers the uterus lining to break down, this is called menstruation.

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During menstruation, the lining of the uterus (endometrium) breaks down and sheds along with blood, cells, and tissue through the vagina. This process is a natural part of the menstrual cycle and occurs monthly in females of reproductive age who are not pregnant.

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10mo ago
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Q: What and the lining of the uterus break down?
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