EMBRYOLOGY
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the percentage of nitrogen in exhaled air?
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60%
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68%
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72%
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78%
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Explanation:
Detailed explanation-1: -Inhaled air contains approx 21%oxygen, 0.04% carbon dioxide and 79%nitrogen while exhaled air contains approx 16% oxygen, 4% carbon dioxide and also 79% nitrogen.
Detailed explanation-2: -In turn, exhaled air contains: nitrogen – 78% oxygen – 17% carbon dioxide – 4% other gases – 1%.
Detailed explanation-3: -The other primary reason is that, unlike oxygen, nitrogen is very stable in the atmosphere and is not involved to a great extent in chemical reactions that occur there. Thus, over geological time, it has built up in the atmosphere to a much greater extent than oxygen.
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