Question

Give suitable explanation for the following :

Why does gaseous exchange continue in the lungs even during expiration?

Answer 1

Gaseous exchange continues in the lungs even during expiration because expiration is the result of reverse movements of the ribs and diaphragm. As a consequence of the movements of the ribs and the diaphragm, the thoracic cavity is diminished and the lungs are compressed, forcing the air out into the atmosphere.