Question

What are the sacs at the end of the bronchi called?

Answer 1

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Answer 2

Saccular ends of bronchi are called as alveolus (alveoli : Plural).
http://en.wikipedia.org/wiki/Pulmonary_alveolus

Answer 3

They're called alveoli and are situated at the ends of the bronchioli, which lack the supporting rings of cartilage.