a) when arterial PO2 = 60mmHg, Hb saturation is ∼ 80%
b) when arterial PO2 = 40mmHg, Hb saturation is ∼ 75%
c) when arterial PO2 = 30mmHg, Hb saturation is ∼ 40%
d) acidosis shifts the curve to the left
e) decreased PCO2 shifts the curve to the right