Figure 3 - Schematic diagram of lung anatomy with cross-sections of bronchi, bronchioles alveolar ducts, and alveoli. From the following article. Anatomy, development, and physiology of the lungs.

Alveoli in cross-section. The alveoli are organized into bunches, and each bunch is grouped in the alveolar sac. The alveoli touch each other like grapes in a tight bunch.

Save guides, add subjects and pick up where you left off with your BBC account. The alveoli are adapted to provide a very large surface area for gaseous exchange: small size - each of the alveoli ...