Refer to the graph showing ventilation rates in a human. 
As you run up a steep hill, your ventilation rate increases as you breathe faster and more deeply.This increase in ventilation rate is being caused primarily by an increase in the partial pressure of which gas carried in your blood? Based on the graph, what change in arterial PO2 would bring about the same change in ventilation rate as an increase in arterial PCO2 from 40 mm Hg to 50 mm Hg?
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