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Question

The percentage of oxygen in inhaled air is ___________.



Your Answer
A

10%   

Correct Answer
B

21%  

Your Answer
C

15%  

Your Answer
D

4.4%    


Solution

The correct option is B

21%  


Inhalation is the process of drawing of air into the lungs. During the process of inhalation, the lung volume expands as a result of the contraction of the diaphragm and intercostal muscles​. The air that we inhale contains 21% oxygen. The percentage of carbon dioxide in exhaled air is 4.4%. 

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