What is "cervix"?

The cervix is a narrow, cylindrical structure located at the lower end of the uterus in the female reproductive system. It serves as the gateway between the uterus and the vagina. The cervix plays multiple roles, including allowing the passage of menstrual blood during menstruation, providing a channel for sperm to enter the uterus during sexual intercourse, and acting as a protective barrier to prevent infections from reaching the uterus. It also undergoes changes during pregnancy, helping to support the developing fetus and eventually opening up during childbirth to allow the baby to pass through.