Usage examples (36)

• Within alveoli, oxygen from inhaled air is absorbed into the bloodstream in exchange for carbon dioxide waste that is exhaled.
• Finding its way into the smallest divisions of the lungs, called the alveoli, the air comes very near a large surface of blood.
• Lungs contain tiny groups of cells called alveoli, which are lined with a layer of epithelial cells that serve as a critical barrier.
• There are about 300 million alveoli in both lungs.