Oxygen is released, and then it moves into the side of our fetus. Now, at the same time that carbon dioxide concentration on the mother's side is increasing the carbon dioxide on the fetus side is decreasing in concentration because this is moving this way. Now, when we decrease the concentration of carbon dioxide that means less of the CO2 can actually affect that hemoglobin on the side of the fetus. And so we also see a bore effect taking place on this side. So less CO2 means more of that hemoglobin will be able to buy to more of that oxygen that is coming in. And so this is the double bore effect that takes place not only on the mother's side but also on the side of the fetus.