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studentparamedics:

An alveolus (plural: alveoli, from Latin alveolus, “little cavity”) is an anatomical structure that has the form of a hollow cavity. Found in the lung parenchyma, the pulmonary alveoli are the terminal ends of the respiratory tree, which outcrop from either alveolar sacs or alveolar ducts, which are both sites of gas exchange (Oxygen and Carbon Dioxide) with the blood as well.

Image by David Gregory and Debbie Marshall

Taken from Daily Anatomy

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