<prompt> True about Hb dissociation curve isAcidosis shifts O2 dissociation curve to rightCO2 shifts the curve to leftHypoxia shifts curve to left2, 3 DPG has no effect on curve  <response>: Hb-O2 dissociation curve shift to left indicates more affinity of Hb to O2, and thus less delivery of O2 to tissues.Shift to left seen in- Increased pH- Decreased 2,3 DPG, temperature, PCO2- HbF FetalShift to right seen in- Decreased pH- Increased 2,3DPG, temperature, PCO2- HbS Sickle cell 