• Air cells
• Air cells in the lung
• Air sacs
• Air sacs in the lungs
• Honeycomb cells
• I'm ___. Think I'll take a little breather
• Lung cells
• Lung sacs
• Lung sacs (anagram of I LOVE L.A.)
• Lung structures
• Tiny air sacs in the lungs
• Where oxygen and carbon dioxide are exchanged