So that is the bore effect. So as a result of the release of carbon dioxide onto the mother's side we have the bore effect take place on the mother's side. The carbon dioxide affects the affinity of hemoglobin, decreases its affinity for hemoglobin, decreases hemoglobin's affinity for oxygen. 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.