The material that flows from the human female reproductive tract during menstruation is produced by the breakdown of the lining of the?

Every 28 days during ovulation, an ovary sends an egg into one of the fallopian tubes. When the egg is not fertilized by a sperm, the egg leaves the body two weeks later in a process called menstruation. Blood and tissues from the inner lining of the uterus merge to form the menstrual flow.