PATHOLOGY MCQ
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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0.04%
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4%
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16%
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21%
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Detailed explanation-1: -True. The air that we inhale contains around 21% oxygen. This oxygen is used by the body for respiration and therefore the exhaled has less percentage of oxygen (13.6% to 16%).
Detailed explanation-2: -Inhaled air is a mixture of different gases present in the atmosphere. It contains around 78% nitrogen, 21% oxygen, 0.04% of carbon dioxide and other gases.
Detailed explanation-3: -We inhale: nitrogen – 78% oxygen-21% other gases – 1%
Detailed explanation-4: -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. This is because our cells use oxygen from the inhaled air to release energy and give out carbon dioxide as a byproduct.