Which structures are at the end of the smallest tubes in the lungs? 1.cilia 2.cavities 3.alveoli 4.blood cells

Alveoli are the structures that are at the end of the smallest tubes in the lung. Correct 3

The alveoli are sucs at the end of the bronchioles in the lungs with very thin walls in which the work of gaseous exchange takes place. Their function is to exchange oxygen and carbon dioxide molecules to and from the bloodstream.

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