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?

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Q: 66 (IAS/2010)
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?
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,110,35,16,110,13,6

keywords: 

{'pollutant carbon monoxide': [0, 0, 1, 1], 'inhaled co': [0, 0, 1, 1], 'co2': [0, 0, 4, 2], 'oxygen': [3, 0, 1, 0], 'oxygen supply': [0, 0, 2, 1], 'haemoglobin': [10, 1, 0, 2], 'excessive release': [0, 0, 1, 1], 'respiratory centre': [0, 0, 1, 1], 'human body': [40, 2, 44, 29], 'co': [0, 0, 1, 4], 'air': [1, 0, 0, 0], 'brain': [1, 0, 0, 1]}