Excessive release of the pollutant carbon monoxide (CO) into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition?
|A|| When inhaled into the human body, CO is converted into CO2|
|B|| The inhaled CO destroys the chemical structure of haemoglobin|
|C|| The inhaled CO destroys the chemical structure of haemoglobin|
|D|| The inhaled CO adversely affects the respiratory centre in the brain|
Ans. B Exp: Haemoglobin’s oxygen-binding capacity is decreased in the presence of carbon monoxide because both gases compete for the same binding sites on haemoglobin. Carbon monoxide has 200 times much higher affinity for haemoglobin than oxygen does. In carbon monoxide poisoning, oxygen cannot be transported and released to body tissues thus resulting in hypoxia. When haemoglobin combines with CO, it forms a very bright red compound called carboxyhaemoglobin, which may cause the skin of CO poisoning victims to appear pink in death, instead of white or blue.