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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 lungs are tiny air sacs called alveoli which allow oxygen from the air we breathe to be absorbed into the many tiny blood vessels contained with the alveoli. As this happens, the alveoli take in carbon dioxide from the blood vessels and this completes gaseous exchange.