How much oxygen is in exhaled air?
Understand the Problem
The question is asking about the composition of exhaled air, specifically the amount or percentage of oxygen present in it compared to that in inhaled air. This involves understanding respiratory physiology and gas exchange mechanisms in the lungs.
Answer
16%
The final answer is 16%
Answer for screen readers
The final answer is 16%
More Information
When we breathe out, the percentage of carbon dioxide increases significantly, while oxygen decreases from 21% in inhaled air to about 16% in exhaled air.
Tips
A common mistake is to assume that all inhaled oxygen is used up by the body, but in reality, a significant portion remains in the exhaled air.
Sources
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