A) CO affects the nerves of the lungs
B) Co affects the diaphragm and intercostal muscles
C) CO reacts with oxygen reducing percentage of \[{{C}_{2}}\] in air
D) haemoglobin combines with CO instead \[{{O}_{2}}\]and the product cannot dissociate
Correct Answer: D
Solution :
If a person respires in air containing normal amount of oxygen (21%) and small amount of Co he suffers from suffocation because hemoglobin combines with CO to form a stable compound. The affinity of hemoglobin to CO is about 200 times more than for oxygen. 0.1% of CO blocks 50% Hb of the body due to which the oxygen carrying capacity of blood is decreased. This is called hypoxia.
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