EMBRYOLOGY
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Nitrogen which makes up about 79% of the atmosphere is not involved in the breathing process.
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true
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false
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -We inhale: nitrogen – 78% oxygen-21% other gases – 1%
Detailed explanation-2: -Nitrogen makes up almost four fifths of the air we breathe, but being unreactive is not used in respiration at all-we simply breathe the nitrogen back out again, unchanged. However, nitrogen is essential for the growth of most living things, and is found as a vital ingredient of proteins.
Detailed explanation-3: -Because 78 percent of the air we breathe is nitrogen gas, many people assume that nitrogen is not harmful. However, nitrogen is safe to breathe only when mixed with the appropriate amount of oxygen. These two gases cannot be detected by the sense of smell.
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