Pulmonary alveolus
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A pulmonary alveolus, also called an air sac or air space, is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place. Oxygen is exchanged for
A histologic slide of a human alveolar sac
Cryptococcosis of lung in patient with AIDS. Mucicarmine stain. Histopathology of lung shows widened alveolar septum containing a few inflammatory cells and numerous yeasts of Cryptococcus neoformans. The inner layer of the yeast capsule stain red.
Diagrammatic view of lung showing magnified inner structures including alveolar sacs at 10) and lobules at 9)
Lung
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The lungs are the primary organs of the respiratory system in many animals, including humans. In mammals and most other tetrapods, two lungs are located near the backbone on either side of the heart.
Pulmonary alveolus
…alveoli; from Latin alveolus 'little cavity'), also called an air sac or air space, is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place. Oxygen is exchanged for carbon dioxide at the blood–air barrier between the alveolar air and the pulmonary…
The human lungs flank the heart and great vessels in the chest cavity.
Chest CT (axial lung window)
Chest CT (coronal lung window)
Cross-sectional detail of the lung