What is the function of the cervix in the female reproductive system?

The cervix plays a crucial role in the female reproductive system by acting as a connector between the uterus and the vagina. It serves primarily as a passageway for menstrual flow to exit the body and as a conduit for sperm to enter the uterus during fertilization. Additionally, the cervix helps to protect the uterus from infections by producing mucus that can either block or facilitate sperm passage depending on the menstrual cycle. Its structure and function are vital for reproductive health as it also provides support during pregnancy, helping to keep the developing fetus contained within the uterus until delivery.