And that carries the carbon dioxide to the lungs of that mother and the lungs expel the carbon dioxide to the rest of that environment. At the same time, when the lungs inhale, they bring in oxygen. And that oxygen is ultimately brought into this pooling area of that maternal blood. Now, when the oxygen is picked up, it is picked up by these blood vessels. And then the blood vessels connect to the umbilical vein and umbilical vein. This blood vessel, shown in red, actually carries the oxygenated and nutrient filled blood to the organs, tissues and structures found within that developing fetus.