In Which Structure is the PO₂ 104 Mm Hg

Question

In which structure is the PO₂ 104 mm Hg?
A) Pulmonary artery
B) Alveolus
C) Right ventricle
D) Vena cava

Accepted Answer

PO₂ of 104 mm Hg is found in the alveolus, which is where gas exchange occurs between the air in the lungs and the blood in the pulmonary capillaries. The pulmonary artery and right ventricle carry deoxygenated blood away from the heart, while the vena cava carries oxygen-poor blood towards the heart. Therefore, these structures would not have a PO₂ of 104 mm Hg.