Question

why does menstruation occur ?​

Answer 1

Explanation:

A period happens because of changes in hormones in the body. ... The ovaries release the female hormones estrogen and progesterone . These hormones cause the lining of the uterus (or womb) to build up. The built-up lining is ready for a fertilized egg to attach to and start developing.

Answer 2

Answer:

The menstrual cycle occurs due to the rise and fall of hormones such as luteinizing hormone and follicle stimulating Hormone this cycle results in the thickness of the lining of uterus and growth of an opium poem is released in the middle of the cycle if it is not fertilized by a sperm in the uterine lining is broken down and comes out through vegina as blood and other fluids this is known as menstruation.