So to redirect the blood and conserve that oxygen nutrients, we have the Ductus Venus that redirects the blood and bypasses the liver. And the blood enters the inferior veneca. Now, between the right atrium and the left atrium, we have this small door like structure known as the forayman O'Valley. And what that allows us to do is it allows us to basically shunt and bypass the lungs. And so the blood flows from a high pressure, the right atrium to the low pressure, the left atrium. And the high pressure is created as a result of the high resistance and high pressure inside the fluid filled lungs.