At the alveoli, the formation of oxyhaemoglobin is favoured by

In the alveoli, where there is high pO2 , low pCO2 , lesser H+ concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin, whereas in the tissues, where low pO2 , high pCO2 , high H+ concentration and higher temperature exist, the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin.