Question

Short / long answer type questions.
How is oxygen transported in the blood and released in the tissues?

Answer 1

• O2 binds reversibly to haemoglobin in blood to give oxyhaemoglobin. Haemoglobin is a red coloured pigment in the RBCs that contains iron. A maximum of 4 molecules of O2 can bind to a molecule of haemoglobin. The partial pressure of O2 is the primary factor that affects this binding. Other factors that can influence this binding are partial pressure of CO2, temperature and hydrogen ion concentration.
  
• Oxygenation of blood in the lungs displaces carbon dioxide from hemoglobin which increases the removal of carbon dioxide at the pulmonary capillaries of lungs. This is called as the Haldane effect.