Complete each statement and then place them in the correct order, starting with blood in the alveolus. Assume normal, non-diseased, sea level conditions. As RBCs pass through the they experience oxygen unloading and increasing carbonic acid conversion. A red blood cell arrives in the where it is exposed to a PO2 of 104 mm Hg. Returning to the inferior vena cava, the blood is known to have a PCO2 of . After passing through the systemic capillary, of the binding sites for oxygen are now bound with oxygen. Blood enters the pulmonary vein with close to of the binding sites for oxygen saturated. Arriving at the arterial end of the tissue capillaries, the blood PO2 is . Passing through the pulmonary artery, the PO2 is approximately .