One takes place between the umbilical vein and the inferior venecrava. The second one takes place between the right atrium and the left atrium. And the third one takes place between the pulmonary trunk and between our aorter. So once again, if we examine this diagram here, the deoxygenated blood coming from the superior venecave is further mixed with the oxygenated blood that is coming from the inferior venecrava. So we have these two different types of blood coming in and they mix and they enter the right atrium. Now, once they enter the right atrium, there is a high pressure inside the right atrium as a result of the high pressure inside the lungs.