Question

Role of haemoglobin in oxygenation and deoxygenation process

Answer 1

haemoglobin is a carrier protein and vehicles for transport of oxygen in over body by combining a hemoglobin with Oxygen and form oxyhaemoglobin compound.
but it's Binding affinity towards CO is much more than Oxygen about 230 times more

Answer 2

Hemoglobin  abbreviated Hb or Hgb, is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates (with the exception of the fish family Channichthyidae as well as the tissues of some invertebrates. Hemoglobin in the bloodcarries oxygen from the respiratory organs (lungs or gills) to the rest of the body (i.e. the tissues). There it releases the oxygen to permit aerobic respiration to provide energy to power the functions of the organism in the process called metabolism.