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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.
Attached to the outer walls of alveoli are many tiny blood vessels called capillaries. Essentially, the capillaries are like a netting covering the alveolar sacs. The place where the capillary tissue meets the alveolar tissue creates an extremely thin layer that molecules can pass through.It is called the respiratory membrane. Think of a cartoon where a ghost passes right through the walls.ssentially, the capillaries are like a netting covering the alveolar sacs. The place where the capillary tissue meets the alveolar tissue creates an extremely thin layer that molecules can pass through. It is called the respiratory membrane. Think of a cartoon where a ghost passes right through the walls.