Air- with a lot of carbon dioxide and water vapor.
The carbon dioxide is exhaled.
The gas produced by cells and exhaled through the lungs is called carbon dioxide.
co2
CO2 Carbon dioxide
Carbon dioxide is exhaled
To the lungs, to be exhaled.
Carbon Dioxide
Mainstream Smoke
During respiration, Carbon Dioxide or CO2 is exhaled as a waste product.
It needs to get oxygen from the lungs, or drop off carbon dioxide to exhaled out of the body.
If, when you exhaled, all the air in your lungs escaped you wouldn't receive a substantial amount of oxygen to nurish your lungs or your body for that matter.
The muscles in your diaphragm contract to push the air out of your lungs.