And so carbon dioxide will diffuse down its pressure gradient from a high pressure to a low pressure. And oxygen will also diffuse down its gradient, but it will move from the outside to the inside of the capillary, also down its gradient from a value of 105 to a value of 45 mercury. So this is exactly why our exchange takes place in the first place because there is a pressure gradient that exists between the space of the alveolis and the lumen of our capillary where the blood actually flows. Now, by the time the blood actually ends up within our lumen of the pulmonary Venuel, the concentration of carbon dioxide and oxygen will be the same inside the lumen as inside our alveolar space. And that's exactly why the diffusion of these two gas molecules essentially stops. And then our pulmonary Venuel connects with larger pulmonary arteries and that carry the oxygenated blood into the left atrium of our heart.