What are the tiny air sacs in the lungs called?

Bladder

Nostrils

Alveoli

Trachea

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Solution

The correct option is C
Alveoli

Lungs have tiny air sacs called alveoli. Alveoli are closely associated with capillaries. The oxygen present in the air inside the alveoli enters into the blood in the capillary. The carbon dioxide present in the blood in the capillary enters into the alveoli, from where its is exhaled out.

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