During which phase of a capnograph does alveolar gas containing carbon dioxide (CO2) mix with gas from the anatomical airways and the CO2 concentration rises?
a. Phase 1
b. Phase 2
c. Phase 3
d. Phase 4
ANS: B
In phase 1, the initial gas exhaled is from the conducting airways, which contain low levels of carbon dioxide (CO2) from inspired air. During phase 2, alveolar gas containing CO2 mixes with gas from the anatomical airways and the CO2 concentration rises. In phase 3, the curve plateaus as alveolar gas is exhaled. In phase 4, the concentration falls to zero.
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