A slight decrease in arterial PO₂ below normal is a more potent stimulus toward increasing respiration than is a slight increase in PCO₂ above normal.

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A slight increase in arterial PCO₂ above normal is a more potent stimulus toward increasing respiration than is a slight decrease in arterial PO₂ below normal. The body's chemoreceptors are more sensitive to changes in CO₂ levels than to changes in O₂ levels.

A Slight Decrease in Arterial PO₂ Below Normal Is a More