Alveoli Alveoli are the little sacs at the end of the bronchioles (Figure below). They look like little bunches of grapes. Oxygen is exchanged for carbon dioxide in the alveoli. That means oxygen enters the blood, and carbon dioxide moves out of the blood.
The surgeon describes the risks and benefits of the surgery, being careful not to share her opinion that the surgery is the best option for long-term heart health.
