What are the little sacs at the end of the bronchioles called?

What are the little sacs at the end of the bronchioles called?

Correct Answer: ganglion
lung
respiratory sacs
alveoli

Explanation: The bronchioles lead to the alveoli. Alveoli are the little sacs at the end of the bronchioles ( Figure below ). They look like little bunches of grapes. Oxygen is exchanged for carbon dioxide in the alveoli. That means oxygen enters the blood, and carbon dioxide moves out of the blood. The gases are exchanged between the blood and alveoli by simple diffusion.

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