Question

What is the percentage of carbon dioxide in exhaled air?

• A. 21%
• B. 0.04%
• C. 4.4%
• D. 16.4%

Answer 1

The correct option is C

4.4%

The percentage of carbon dioxide in exhaled air is more than that of the percentage of carbon dioxide in the inhaled air. Inhaled air has about 0.04% of carbon dioxide. This is also the amount of carbon dioxide present in the atmosphere. The exhaled air contains all the carbon dioxide that is a by product of the cellular metabolic processes. Hence, the percentage of carbon dioxide in the exhaled air is 4.4%.