AIIMS 2008
- Exam
- AIIMS
- Year
- 2008
- Subject
- Zoology
- Chapter
- Breathing and Exchange of Gases
AIIMS 2008 · Zoology · Breathing and Exchange of Gases
When a man inhales air containing normal concentration of (O_2) as...
When a man inhales air containing normal concentration of (\mathrm{O}_2) as well as (\mathrm{CO}) he suffers from suffocation because
Options
- A(\mathrm{CO}) reacts with (\mathrm{O}_2) reducing its percentage in air
- Bhaemoglobin combines with (\mathrm{CO}) instead of (\mathrm{O}_2) and forms carboxyhaemoglobin
- C(\mathrm{CO}) affects diaphragm and intercostal muscles
- D(\mathrm{CO}) affects the nerves of the lungs.
Correct answer
B. haemoglobin combines with (\mathrm{CO}) instead of (\mathrm{O}_2) and forms carboxyhaemoglobin
Step-by-step solution
Affinity of carbon monoxide for haemoglobin is 200 times more than oxygen. At 0.5 partial pressure, combines with of haemoglobin. It produces a relatively stable compound called carboxy-haemoglobin. This causes low supply of oxygen to the body which is characterised by headache, dizziness, nausea, etc.