What are the tiny balloon-like structures located at the end of the smallest tubes in the human lungs called?
Alveoli
Air inhaled through the trachea enters the two bronchi, which branch repeatedly into ever-narrower bronchioles inside each lung.
At the tip of the finest bronchioles sit clusters of tiny thin-walled sacs shaped like microscopic balloons; these are the alveoli, and their moist walls and dense capillary meshwork allow rapid diffusion of oxygen into the blood and carbon dioxide out of it.
Bronchi and bronchioles are only conducting tubes, not sacs, while villi are finger-like projections of the small intestine that absorb digested food, so they are not part of the lungs.
Hence, the tiny balloon-like structures at the end of the smallest tubes in the lungs are called alveoli.
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