In the figure, what does area X represent?
a. Amount of CO2 not eliminated because of alveolar dead space
b. Amount of CO2 not eliminated due to an-atomic dead space
c. Amount of CO2 in a single breath
d. Amount of CO2 rebreathed
ANS: C
Area X represents the actual amount of CO2 exhaled in the breath, assuming that no exhaled air is rebreathed. This is the volume of CO2 in a single breath.
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