Answer
Fig 21.29
After birth, the pulmonary arteries are the only arteries that carry deoxygenated blood. They transport blood to the lungs. Oxygenated blood from adult lungs reach the heart ( left atrium) by way of the pulmonary veins.
Work Step by Step
An artery by correct definition is a blood vessel that carries blood away from the heart ; a vein is a blood vessel that carries blood towards the heart. However, these definitions only apply after birth.
In fetuses, the aorta and the and the umbilical arteries transport mixed blood (oxygenated+deoxygenated). The umbilical veins of the placenta conduct oxygenated blood from the placenta to the fetus.
