Release of Oxygen at the Tissue Level MCQ - Practice Questions with Answers

• The dissociation of oxyhaemoglobin depends on and of the cell, as explained through the Bohr’s effect.
• High temperature and low pH at the tissue level favour the dissociation of oxygen from the haemoglobin.
   

• At the alveoli, the blood capillaries are subjected to high oxygen and low carbon dioxide concentration.
• As a result, there is a speedy reversal of chemical events releasing CO2 and picking up O2 simultaneously.
• CO2 dissolved in plasma diffuses into alveoli.
• Carbaminohaemoglobin also splits into CO2 and Hb.
• For the release of CO2 from the bicarbonate ions, the following reactions occur:
  • The reduced haemoglobin is reversed when oxygen binds to the Hb.
  • The chlorine ions are released from KCl and bicarbonate ions are released from sodium bicarbonate.
  • The bicarbonate ions react with hydrogen ions to form CO2 in the presence of enzyme carbonic anhydrase.

Haldane Effect:

• Binding of oxygen with Hb tends to displace carbon dioxide from the blood. 
• This phenomenon is called the Haldane effect.
• It is a more important factor in the transport of carbon dioxide than the Bohr’s effect.