Question

why does menstrunation occur?​

Answer 1

Answer:

A period happens because of changes in hormones in the body. Hormones are chemical messengers. The ovaries release the female hormones estrogen and progesterone . These hormones cause the lining of the uterus (or womb) to build up.

Explanation:

It is normal in girls and women and starts when a girl is a teenager or 11-12 years old .

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Answer 2

If fertilization of egg does not take place then, corpus luteum degenerates ,uterine wall ruptures , bleeding starts and the unfertilized egg is expelled . This is the reason why mensuration occurs