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Alveoli / air sacs

Tiny air sacs where oxygen moves from lungs into blood.

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What it is

Alveoli are tiny air sacs in the lungs.[1,2]

Why it matters

Pneumonia can fill air sacs with fluid or pus, while fibrosis can thicken walls around gas exchange.[1,2]

What it affects

  • Air-sac context connects infection, scarring, and oxygen transfer.[1,2]

Interpretation traps

  • Alveolar problems cannot be localized without clinical evaluation.[1,2]

Related conditions

Pneumonia and air-sac infectionPulmonary fibrosis and lung scarring