air sac

noun

Pronunciation: /ˈɛər sæk/

Definition

A tiny, thin-walled cavity in the lungs or other organs where gas exchange occurs.

Examples

• The lungs contain millions of air sacs that facilitate the transfer of oxygen into the bloodstream.

• Damage to the air sacs can lead to chronic respiratory conditions that make breathing difficult.

• Birds possess specialized air sacs that help them maintain a continuous flow of oxygen during flight.

Synonyms of air sac

Words with a similar meaning to air sac:

• alveolus

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