The tube that this question is referring to is known as the Fallopian tube. The woman's reproductive system is important as a whole, but the Fallopian tube has an important role all by itself. Four organs make up the Fallopian tube. These four organs are the vagina, ovaries, uterus, and eggs. When a child is born, it starts as an egg and grows into an embryo.
The tube is the start of the entire process the child goes through from an egg to birth. This is why the Fallopian tubes are important because without them, a woman would not be able to reproduce.