Oxygen rich - the opposite of what the majority of veins are in the body.
Oxygen poor blood
The only vein that normally carries oxygen rich blood is the pulmonary vein which carries freshly oxygenated blood from the lungs back to the heart for distribution to the body. Ordinary veins can have oxygen poor blood but don't carry oxygen rich blood.
Umbilical Vein, all other vessels have varying degrees of oxygenated and deoxygenated blood.
Because it does.
The pulmonary artery carries oxygen-poor blood. The pulmonary vein carries oxygen-rich blood.
The right atrium and ventricle of the heart, as well as veins, contain oxygen-poor blood. The left atrium and ventricle, as well as the arteries, contain oxygen-rich blood. One exception to this is the pulmonary vein and artery, which are reversed - pulmonary artery contains oxygen-poor blood and pulmonary vein contains oxygen-rich blood.
An Artery caries Oxygen Rich blood and a Vein carries Oxygen Poor blood, but not by definition because the Pulmonary Arteries carry Oxygen Poor blood and the Pulmonary Veins carry Oxygen Rich blood, (these vessles can be found between the heart and the lungs).
There are two veins that carry oxygen they are the Pulmonary vein and the Umbilical vein:-)
Umbilical vein is saturated with oxygen and devoid of carbon bi oxide. Umbilical arteries has lost much of the oxygen and it is replaced with carbon bi oxide. Umbilical vein is full on digested food material, like amino acids, glucose, fatty acids, vitamins and minerals. Umbilical arteries has got waste products of metabolism and lost much of the food material to the fetus. The blood pressure is umbilical vein is very low. The blood pressure in the umbilical arteries is high.
pulmonary vein
No, Umbilical arteries take deoxygenated blood from the fetus to the placenta, it is the umbilical vein carries the oxygenated blood from the placenta to the futus.
Veins and arteries are not classified by whether they carry oxygen-rich or oxygen-poor blood. They are classified according to whether they carry blood to the heart or away from the heart. Veins carry blood to the heart and arteries carry blood away from the heart. So the pulmonary vein carries blood to the heart, which is why it is a vein. Also, the pulmonary artery, which carries oxygen-poor blood to the lungs is an artery because it carries blood away from the heart.