The area under the curve of a single-breath carbon dioxide (SBCO2) curve represents which of the following?
a. Tidal volume
b. Alveolar dead space
c. Physiologic dead space
d. Effective alveolar ventilation
ANS: D
The area under the single-breath carbon dioxide (SBCO2) curve represents alveolar volume. This is known as phase 3 on the SBCO2 curve. Phase 1 is the anatomical dead space volume. Phase 2 is a transitional phase between anatomical dead space and alveolar volume.
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