And what that allows is it allows the exchange of nutrients and waste products and minerals and oxygen, carbon dioxide between the blood of that fetus and the blood of the mother, as we'll see in just a moment. So this entire diagram basically describes the components of our placenta. We have the Coriane that comes from the Trophy blast. We have these Corianic villi which are in contact with the mother's blood. And we have these maternal blood vessels, which essentially have ruptured and created the pooling of that blood within the endometrium in our placenta. Now, we also have the Biblical cord, which contains those two blood vessels, the two types of blood vessels.