Q1. The graph below plots the oxygen saturation curves for hemoglobin under different conditions. The solid curve represents the curve observed under physiological conditions. C Fractional Saturation 1 0.8 0.6 0.4 0.2 0 20 40 60 PO (kPa) 80 100 120 0 (i) Which curve (A, B or C) represents that predicted when metabolic activity leads to an increase in the production of acidic byproducts in the tissues? Briefly explain. (ii) Which curve (A, B or C) represents that predicted when the -subunits of hemoglobin are substituted with the y-subunits found in fetal hemoglobin? Briefly explain. (iii) Which curve (A, B or C) represents that predicted when a person just arrived in a city with the higher altitude? Briefly explain.