a a drop in the ph of blood plasma from 7.4 to 7.2 b a decrease in the partial pressure of co2 in the lungs from 6 kpa (holding one's breath) to 2 kpa (normal) c an increase in the bpg level from 5mm (normal altitude) to 8mm (high altitude) d an increase in co from 1 ppm (normal indoor atmosphere) to 30 ppm in a home with a malfunctioning furnace