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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.
Rating Newest Oldest. Best Answer: The alveoli in the lungs are tiny sacs of air surrounded by an intricate web of blood vessels. Oxygen from inhaled air diffuses from this air sac across into the blood down its concentration gradient.Carbon dioxide diffuses from the blood into the air sac to be exhaled.The process of diffusion is a passive process but it can be made more efficient by several factors.The first is surface area ~ the greater the surface area, the greater the rate of diffusion.ating Newest Oldest. Best Answer: The alveoli in the lungs are tiny sacs of air surrounded by an intricate web of blood vessels. Oxygen from inhaled air diffuses from this air sac across into the blood down its concentration gradient.