Figure 8 - Measurement of dead space.
From the following article
Anatomy, development, and physiology of the lungs
Richard M. Effros
GI Motility online (2006)
doi:10.1038/gimo73
The total (physiologic) dead space reduces the PCO2 of the mixed expired gas (PECO2) and can be calculated by measuring the arterial and mixed expired gas. Partial pressures of CO2 at the sites indicated by the eyes are indicated on the right.
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