Question

In blood, carboxyhaemoglobin forms by

• A. Inhalation of CO
• B. Inhalation of $C{O}_2$
• C. Inhalation of $S{O}_2$
• D. Inhalation of Ozone

Answer 1

The correct option is A Inhalation of CO

Carbon monoxide is a poisonous gas released into the atmosphere by the incomplete combustion of fossil fuels. It has a greater affinity for hemoglobin than oxygen. This gas, when inhaled, combines with hemoglobin in red blood cells to form carboxyhemoglobin. Carboxyhemoglobin decreases the oxygen-carrying capacity of blood which may be fatal. Thus, the correct answer is option A.