Breathing And Exchange Of Gases

Curve C does not favour association. affinity increases with decrease in .

Oxygen dissociation from oxyhaemoglobin in tissues is affected bypH (H⁺ concentration)andtemperature.1. Effect ofH⁺In tissues, during high metabolic activity,CO₂andlactic acidincrease.This increases[H⁺], loweringpH.A lower pH (higher [H⁺])reduces haemoglobin’s affinity for O₂, so O₂ is released more easily.This is called theBohr effect.✅ Therefore,higher [H⁺]favors oxygen dissociation.2. Effect of temperatureTissues undergoing metabolism produce heat.Higher temperaturealso decreases O₂ affinity of haemoglobin.Hence,higher temperaturefavors oxygen unloading.✅ Therefore,higher temperaturefavors oxygen dissociation.✅ Correct AnswerOption A— higher [H⁺]; higher temperature.Answer: A. higher [H⁺]; higher temperature