How does haemoglobin help in transport of ${{O}_{2}}$ from lungs to tissues?

cbse
circulation

#1

Haemoglobin has high affinity for oxygen. It binds oxygen at the level of lung alveoli to form oxyhaemoglobin and releases oxygen at the level of body tissues due to low ${{pO}_{2}}$ Each haemoglobin molecule can hind to four molecules of oxygen.