Bronchial Alveoli

See Also: Bronchial Alveolus | Lungs (Cut View) | Did you know?

Alveoli

Alveoli are small, balloonlike sacs at the end of the small air passages in the lungs (the bronchiole). Oxygen is inhaled and absorbed into the bloodstream through the thin wall of each alveolus, and carbon dioxide is passed the other way (from the blood to the lungs) to be exhaled. There are about 300 million alveoli in each lung.

Definitions, Pick Points, & Zoom:

Alveolar Capillaries
Alveolus
Bronchus
Lung (cross section)
Pulmonary Artery
Pulmonary Vein
Respiratory Bronchiole (detail)
Terminal Bronchiole