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Conclusion Questions 3.3.1 1. The walls of the alveoli in the lungs are incredibly thin. Explain how this structure is related to function in the body. The walls of the alveoli are extremely thin so that they can serve their purpose of allowing diffusion of oxygen and carbon dioxide to happen. This is where gas exchange occurs.
Within the alveolar walls is a dense network of tiny blood vessels called capillaries. The extremely thin barrier between air in our lungs and the capillaries allows oxygen to move from air in the alveoli into the blood and allows carbon dioxide to move from the blood in the capillaries into the alveoli.