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If the egg fails to get fertilized by a sperm it has to be expelled and this process is started by the lowering of progesterone and estrogen levels that causes the uterus lining to break down and release a compound named prostaglandins. Prostaglandins causes the contraction of the uterine muscles that causes the breakdown of the egg and further contractions cause it to expelled through the vagina.

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Tierra Keeling

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Q: How menstruation happens?
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Related questions

If an egg isn't fertillized. what happens to the egg?

it is lost in menstruation


What event happens two weeks before menstruation?

ovulation


What happens to estrogen progesterone levels prior to menstruation?

they increased


What happens during the first stage of the menstrual cycle?

menstruation


Is anal menstruation normal?

Anal bleeding is usually caused by hemorrhoids, not by menstruation. It could also be a symptom of a more serious gastro-intestinal illness, but it is never menstruation, which happens in a different orifice entirely.


What happens Shortly before menstruation?

Blood levels of estrogen and progesterone decrease.


Why do you get menstruation?

It's a normal thing for every female. But some get irregular menstruation which means she might have a problem in her reproductive system which should be checked by a doctor. Why do you get menstruation? It's a sign which means you are ready to be pregnant. And it happens when a girl becomes mature and got through puberty except menstruation.


What happens to the unfertilized eggs in the human female?

They are absorbed and later passed out during menstruation.


What happens to an egg if it is not fertilized by the time it reaches the uterus?

It leaves the body in the process of menstruation.


What the age the menstruation stop?

Menopause usually happens betwenn the ages of 45 and 55.


What happens a week after menstrual cycle?

Menstrual cycle refers to the entire reproductive cycle, starting during menstruation - there is no 'after the menstrual cycle' but I think you might mean after menstruation. After menstruation the cycle starts again, typically a woman will be fertile around a week after menstruation so her body will produce fertile cervical mucus and she will ovulate.


Stage in a girl's life when menstruation usually starts?

Menstruation usually starts after the breasts have started developing. It normally happens from the ages of 8-16. It will be obvious that a girl is getting near womanhood.