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.
Nutrient recommendation that meets the nutrient requirements of 97 to 98 percent of healthy people provides a reference chart for people following either a 2,000 calorie or 2,500 calorie diet.
