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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Guadalupe

30 August, 23:56

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Nathaniel Knox · Answer 1

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

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

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