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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.
1 Greater partial pressure of O2 in alveolar air / more O2 dissolves in blood (Henry's Law) 2  Alveoli walls are composed of endothelium â gases diffuse through 2 thin cells. 3  Alveoli is constantly moist.  O2 can dissolve and diffuse through the cells into the blood.