Which of the following situations will cause an increase in the single-breath carbon dioxide (SBCO2) curve?
a. Decreased metabolic rate and decreased ventilation
b. Decreased metabolic rate and increased ventilation
c. Increased metabolic rate and increased ventilation
d. Increased metabolic rate and decreased ventilation
ANS: D
The same cause for an increase in arterial partial pressure of carbon dioxide (PaCO2) will increase the single-breath carbon dioxide (SBCO2) curve. An increase in metabolic rate will increase the carbon dioxide (CO2) production in the body. This, accompanied by either no change in ventila-tion or a decrease in ventilation, will cause the amount of CO2 in the body to increase and thus cause the amount of CO2 exhaled to increase. The only combination that will do this is "D," in-creased metabolic rate and decreased ventilation.
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