This section shown by number seven. So let's zoom in on this region that contains this capillary section here. So we basically get the following diagram. So we have the pulmonary arterio, we have the pulmonary capillary, and we have the pulmonary venue. So our deoxygenated blood essentially travels along the pulmonary terio until it gets to our capillary, which is this section right here. Now, deoxygenated blood has a relatively high concentration of carbon dioxide and a relatively low concentration of oxygen compared to the concentrations of these molecules, gas molecules, inside the alveolar space.