So let's begin by actually looking at the structure of our placenta. So this is a diagram of the placement placenta. So we have the umbilical cord shown here that contains two types of blood vessels. We have the umbilical vein shown in red and we have umbilical arteries shown in blue. So the umbilical arteries carry deoxygenated blood that contains carbon dioxide from the organs and tissues of that fetus and to the placenta itself. And it carries them to these Corianic villi, these extensions of the Coriane known as the corionic villi.