Alveoli are tiny, balloon-shaped air sacs located at the end of the bronchioles, the branch-like tubes in the lungs. The alveoli move oxygen and carbon dioxide (CO 2) molecules into and out of your ...

The alveoli are microscopic, balloon-like structures in the lungs that play a crucial role in respiration. If they are damaged, they may be able to self-repair, but medical attention is key to ...

Gas exchange or respiration takes place at a respiratory surface; a boundary between the external environment and the interior of the body. For unicellular organisms the respiratory surface is simply ...