How does the oxygen affect the process of cellular respiration?

Answer 1

We just talked about O2 binding and releasing [4 O2's at a time] from haemoglobin molecules that transport oxygen through the blood. The poisonous nature of CO comes from the fact that while it readily binds to haemoglobin it will not disassociate! Carbon monoxide poisoning [lack of O2 supply] results.

Answer 2

Carbon monoxide preferentially bonds to the hemoglobin instead of oxygen. So your red blood cells are transporting carbon monoxide instead of oxygen.

Answer 3

Carbon monoxide has craving for the atom of the oxygen. It will get combined to the oxygen and then will deprive the cell of oxygen.

Answer 4

Formation of caboxyhemoglobin and the consequent reduction of the oxygen concentration in blood. The effect can be lethal.