What the cervix does @(Model.HeadingTag)>
The cervix connects the body of the uterus to the vagina. Part of the lining of the cervix contains glands that make and release mucus. For most of the menstrual cycle and during pregnancy, the mucus is thick and stops sperm from entering the uterus. The thick mucus also helps to protect the uterus and the upper female reproductive organs from harmful bacteria.
When a mature egg is released from an ovary each month (called ovulation), the mucus changes and becomes thinner. The thinner mucus allows sperm to pass through the cervix into the uterus.
Every month, except during pregnancy or menopause, the lining of the uterus (called the endometrium) is shed through the cervix into the vagina, then out of the body. This process is called menstruation.
During childbirth, the cervix widens (dilates), allowing the baby to pass through the birth canal.
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