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endometrium

the endometrium is the mucous membrane that lines the inside of the uterus.

the endometrium changes throughout the menstrual cycle. about once a month, it thickens with extra blood vessels. a pregnancy can occur if a fertilized egg attaches to, or implants in, the endometrium. if a fertilized egg doesn't implant, part of the endometrium is shed, causing menstrual bleeding.

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this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use and privacy policy. to learn more about healthwise, visit healthwise.org. © 1995-2022 healthwise, incorporated. healthwise, healthwise for every health decision, and the healthwise logo are trademarks of healthwise, incorporated.

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