At the same time, we have more blood flowing into the order. So the order increases in pressure. And now we have a high pressure in the order, a low pressure in that pulmonary trunk. And so what happens is blood stops flowing from the trunk and to the order. So eventually, the ductus arteriosis will also constrict and will also diminish in size until it stops functioning. Now, to be more specific, what happens is as soon as the pressure inside the lungs increases and as soon as the oxygen is carried into the lungs, the lungs begin producing a special type of peptide, a special type of protein known as bradycanin.