Multiple Choice
In plants, gas exchange occurs through small openings on the leaves called _______.
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40. Circulatory System
Gas Exchange
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Which waste gas is primarily removed from the blood during expiration in humans?
A
Methane ($\mathrm{CH_4}$)
B
Oxygen ($\mathrm{O_2}$)
C
Carbon dioxide ($\mathrm{CO_2}$)
D
Nitrogen ($\mathrm{N_2}$)
Verified step by step guidance1
Understand the process of gas exchange in humans: During respiration, oxygen ($\mathrm{O_2}$) is inhaled into the lungs and transported to the blood, while carbon dioxide ($\mathrm{CO_2}$), a waste product of cellular respiration, is removed from the blood and exhaled.
Recall the role of the alveoli in the lungs: Alveoli are tiny air sacs where gas exchange occurs. Oxygen diffuses from the alveoli into the blood, and carbon dioxide diffuses from the blood into the alveoli.
Identify the waste gas produced during cellular respiration: Cells use oxygen ($\mathrm{O_2}$) to break down glucose, producing energy, water, and carbon dioxide ($\mathrm{CO_2}$) as a byproduct.
Recognize the primary waste gas removed during expiration: Carbon dioxide ($\mathrm{CO_2}$) is transported in the blood to the lungs, where it is expelled during exhalation.
Eliminate incorrect options: Methane ($\mathrm{CH_4}$) is not produced in significant amounts by human metabolism, oxygen ($\mathrm{O_2}$) is absorbed rather than expelled, and nitrogen ($\mathrm{N_2}$) is largely inert and not a waste product of metabolism.
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