If you don't believe this, find someone who has been smoking cigarettes for fifty years. They might have a disease called emphysema . People with emphysema get out of breath very quickly. Even getting out of the chair to change channels on the TV makes them puff and pant as though they had run the marathon. Perhaps that is why we need remote controls for our TVs and radios.
Gaseous exchange is also necessary for photosynthesis.
Oxygen in and Carbon Dioxide out. In the daytime they do just the opposite. Carbon Dioxide enters a plant because it is needed for photosynthesis, and Oxygen leaves. This is still called gaseous exchange. Copyright 1997 - 2000 Gondar Design.