Now, as it moves this way, what happens is the concentration of the carbon, the oxide, begins to increase within the side of the mother. And by increasing the CO2 concentration, that makes the hemoglobin much more likely to actually release the oxygen. And once oxygen is released, we have the bore effect. 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.