The bronchial tree serves as the airway system, branching into smaller and smaller air passages, while the alveoli are responsible for the exchange of oxygen and carbon dioxide between the respiratory ...

The gas exchange system affects oxygen, nitrogen and carbon dioxide from the air. Find out more with BBC Bitesize in this article for 11-14 year old students.

A pulmonary alveolus is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place. Oxygen is exchanged for carbon dioxide at the blood–air ...

Gas exchange occurs in the alveoli, which are tiny, balloon-shaped structures in the lungs. It is when oxygen is absorbed into the bloodstream and carbon dioxide is released.