What effect (increase/decrease) would you expect each of the following to have on the p50 of hemoglobin? increase/decrease (a) a drop in the ph of blood plasma from 7.4 to 7.2. increase/decrease (b) a decrease in the partial pressure of co2 in the lungs from 6 kpa (holding one’s breath) to 2 kpa (normal). increase/decrease (c) an increase in the 2,3-bpg level from 5 mm (normal altitudes) to 8 mm (high altitudes). increase/decrease (d) an increase in co from 1.0 parts per million (ppm) in a normal indoor atmosphere to 30 ppm in a home that has a malfunctioning or leaking furnace.