Alveoli are tiny air sacs in your lungs that ... The right lung has three sections (lobes), and the left has two sections (above the heart). The larger branches in each lobe are called bronchi.

a: Gross anatomy of lung and thorax. b: Microscopic anatomy of bronchial wall. C: View of terminal airway and alveoli. d: Alveolar structure.

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 ...