Problem
a) The chemoreceptors that monitor arterial PO2 respond when arterial PO2 drops < 60 mmHg. Since normal arterial PO2 is 100 mmHg this seems odd. But Look at the human blood oxygen equilibrium curve (OEC). What would the Hb % SAT be at 60 mmHg PO2?
b) What happens on the OEC if oxygen drops lower than this?