Body Basics: How Well Do You Know Your Body?Share:FacebookPinterestTwitterMailWhat are the tiny air sacs in your lungs where oxygen enters the blood?86%Next Correct Incorrect Alveoli have very thin walls, allowing for efficient exchange of oxygen and carbon dioxide. What are the tiny air sacs in your lungs where oxygen enters the blood? Bronchi Trachea Larynx Alveoli 86%
