Multiple Choice
Which of the following correctly describes a key event in gas exchange in the human lungs?
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40. Circulatory System
Gas Exchange
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Which of the following is NOT transferred across the alveolar membrane during gas exchange in the human lungs?
A
Glucose
B
Water vapor ($H_2O$)
C
Oxygen ($O_2$)
D
Carbon dioxide ($CO_2$)
Verified step by step guidance1
Understand the function of the alveolar membrane: The alveolar membrane in the lungs is specialized for gas exchange, allowing the transfer of gases like oxygen ($O_2$) and carbon dioxide ($CO_2$) between the air in the alveoli and the blood in the capillaries.
Recognize the substances involved in gas exchange: Oxygen ($O_2$) is absorbed into the blood to be transported to tissues, while carbon dioxide ($CO_2$), a waste product of cellular respiration, is expelled from the blood into the alveoli to be exhaled.
Consider the role of water vapor ($H_2O$): Water vapor is also present in the lungs and can diffuse across the alveolar membrane, contributing to the humidification of air during respiration.
Evaluate the role of glucose: Glucose is a large molecule that is transported in the blood but is not involved in the gas exchange process across the alveolar membrane. It is transported to cells via the bloodstream for energy production, not through the lungs.
Conclude that glucose is NOT transferred across the alveolar membrane during gas exchange, as it is not a gas or a small molecule involved in respiratory processes.
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