Question

Which gas is more in exhaled air than in inhaled air?

• A. Oxygen
• B. Carbon dioxide
• C. Nitrogen
• D. Carbon monoxide

Answer 1

Answer: (B)

Carbon dioxide

• The reason we breathe is to get oxygen into our bodies to allow for respiration. From the above given table you can interpret that:
• The amount of inhaled air contains 21% of oxygen and 0.04% of carbon dioxide, while the air we breathe out contains 16.4% of oxygen and 4.4% of carbon dioxide and the percentage of nitrogen stays at nearly 79% ( as we do not have any use for nitrogen).
• This is because during the process of respiration our cells use oxygen from the inhaled air to release energy and give out carbon dioxide as a byproduct.