could someone explain what gaseous exchange is please
Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
Oxygen is passed from the bronchiole to the alveoli. Here the oxygen is taken into the bloodstream by the capillaries located on the alveoli.Carbon exchanges its position with the oxygen and is exhaled. I hope this helps!