Expired Air Has More Than 100 Times More _______ Than

Question

Expired air has more than 100 times more _______ than air inspired from the environment.
A) oxygen
B) surfactant
C) hydrogen
D) carbon dioxide

Accepted Answer

The correct answer is carbon dioxide. When we exhale, we breathe out carbon dioxide which is a waste product of cellular respiration. This means that expired air has more carbon dioxide than air inspired from the environment. In fact, expired air has approximately 100 times more carbon dioxide than inspired air.