Its basic components are: Alveoli: minute air sacs, where oxygen enters the blood Bronchi and Bronchioles: tubes to channel air into the lungs Cilia: microscopic hair-like structures clean out mucus and other debris from airways to cleanse the air What happens to a Smoker's Lungs
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Therefore, dependence on diffusion as a means of obtaining oxygen and removing carbon dioxide remains feasible only for small organisms or those with highly-flattened bodies, such as many flatworms (Platyhelminthes)