Each lung consists of millions of tiny air sacs called_. Each air sac is surrounded by a tiny blood vessel called a_.

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asked Nov 19, 2018 142k views

1 Answer

Chukwuma · Answer 1 · 2018-11-25T02:55:53+0000

Each lung consists of millions of tiny air sacs called alveoli.

Each air sac is surrounded by a tiny blood vessel called an arteriole.