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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.
The oxygen needed in this complicated process in the cells comes mainly from the lungs to the blood. The alveoli in the lungs are tightly wrapped in small blood vessels, capillaries. Capillary walls are so thin that gases like oxygen, carbon dioxide and water molecules can pass through them.