Multiple Choice
Which of the following are reactants of cellular respiration?
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8. Respiration
Introduction to Cellular Respiration
Multiple Choice
The concentration of which gas is higher in exhaled air than in inhaled air?
A
Argon (\(ext{Ar}\))
B
Carbon dioxide (\(ext{CO}_2\))
C
Nitrogen (\(ext{N}_2\))
D
Oxygen (\(ext{O}_2\))
Verified step by step guidance1
Understand the composition of inhaled air: Inhaled air primarily contains nitrogen (approximately 78%), oxygen (approximately 21%), and trace amounts of other gases like argon and carbon dioxide.
Recognize the process of gas exchange in the lungs: During respiration, oxygen (\(\text{O}_2\)) is absorbed into the bloodstream, and carbon dioxide (\(\text{CO}_2\)) is released from the bloodstream into the lungs.
Compare the composition of exhaled air: Exhaled air contains less oxygen (\(\text{O}_2\)) because it is used in cellular respiration, and more carbon dioxide (\(\text{CO}_2\)) because it is a waste product of metabolism.
Analyze the role of other gases: The concentration of nitrogen (\(\text{N}_2\)) and argon (\(\text{Ar}\)) remains relatively unchanged between inhaled and exhaled air because these gases are not involved in the respiratory process.
Conclude that the concentration of carbon dioxide (\(\text{CO}_2\)) is higher in exhaled air compared to inhaled air due to its production during cellular respiration.
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