What type of blood do each of the umbilical blood vessels carry?
The umbilical vein carries oxygen-rich and nutrient-rich blood. The umbilical arteries carry de-oxygenated blood.
The following diagram shows a fetus, the placenta and the umbilical blood vessels.
Here we can see, there are three umbilical vessels : 2 arteries and 1 vein. IN the diagram the two umbilical arteries are colored blue. They carry de-oxygenated blood from the fetus to the placenta.
The umbilical vein, here, is colored red. The vein carries oxygenated and nutrient-rich blood from the placenta to the fetus. The umbilical vein is the only source of oxygen and nutrients for the fetus.
The above diagram is showing the fetal circulation. We can see the umbilical vein is carrying blood from the placenta. This blood is oxygen and nutrient rich (hence the color red). This blood is being circulated to the whole body of the fetus. And from the internal iliac arteries the umbilical arteries are being formed. These arteries carry blood with less oxygen and nutrients.