Multiple Choice
In lung physiology, what is the primary function of the respiratory system?
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22. The Respiratory System
Introduction to Lung Physiology
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In basic lung physiology, what waste product does the respiratory system primarily excrete during exhalation?
A
Carbon dioxide
B
Bile pigments (e.g., bilirubin)
C
Excess glucose
D
Urea
Verified step by step guidance1
Understand the primary function of the respiratory system, which is to facilitate gas exchange between the body and the environment.
Recall that during cellular respiration, cells produce energy by using oxygen and generating carbon dioxide as a waste product.
Recognize that the respiratory system removes this waste gas, carbon dioxide, from the bloodstream and expels it during exhalation.
Differentiate carbon dioxide from other waste products like bile pigments, excess glucose, and urea, which are primarily handled by other systems such as the liver and kidneys.
Conclude that the respiratory system primarily excretes carbon dioxide during exhalation.
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