WHY DOES MENSTRUATION OCCURS???
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The menstrual cycle occurs due to the rise and fall of hormones. This cycle results in the thickening of the lining of the uterus, and the growth of an egg, (which is required for pregnancy). ... If pregnancy does not occur, the lining is released in what is known as menstruation
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Why does menstruation occur?
When Fertilisation does not occur and embryo is not formed, the endometrium breaks down & bleeding occur.
This process is called menstruation.
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