Final answer:
The umbilical cord contains two arteries and one vein that transport blood between the fetus and the placenta during prenatal development.
Step-by-step explanation:
The nurse should observe two arteries and one vein in the umbilical cord.
The umbilical cord of a newborn infant contains two arteries and one vein that carry blood between the fetus and the placenta.
During prenatal development, the umbilical arteries carry oxygen-depleted blood from the fetus to the placenta, while the umbilical vein carries oxygen-rich blood from the placenta to the fetal heart.