What is the term used to describe the passage the fetus is pushed through during delivery?

The term that describes the passage the fetus is pushed through during delivery is the "birth canal." The birth canal is formed by the mother's reproductive structures, primarily the vagina, which serves as the route through which the baby exits the uterus and enters the world during childbirth. This process is crucial in the delivery stage of labor, and understanding the anatomy and physiology of the birth canal is important for those in fields like obstetrics and nursing.

The other options represent different aspects of pregnancy and childbirth but do not pertain to the passage used during delivery. The amniotic sac holds the amniotic fluid that surrounds the fetus, providing a protective environment. The placenta serves as the organ that supplies oxygen and nutrients to the fetus and removes waste products, while the umbilical cord connects the fetus to the placenta, facilitating this exchange. Hence, these terms are all essential in the context of pregnancy but refer to different functions and structures.