Which of the following statements regarding control of respiration is correct?
A. The most important signal for regulating ventilation is the H+ concentration of arterial blood.
B. At high altitude, a decrease in PCO2 of the blood stimulates an increase in ventilation.
C. Increased concentrations of lactic acid stimulate ventilation primarily by acting on peripheral chemoreceptors.
D. An increase in the HCO3- concentration in blood stimulates ventilation.
E. A slight decrease in arterial PO2 is a stronger stimulus for increased ventilation than is a comparable decrease in arterial PCO2.
Answer: C
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