Why is carbon monoxide so dangerous?

The great danger of carbon monoxide (CO) is its attraction to hemoglobin in the bloodstream. When breathed in, carbon monoxide bonds with the hemoglobin in the blood, displacing the oxygen. When CO is present in the air, it rapidly accumulates in the blood, forming a toxic compound known as carboxyhemoglobin (COHb).

Carboxyhemoglobin causes symptoms similar to the flu, such as headaches, fatigue, nausea, dizzy spells, confusion and irritability. As levels of CHOb increase, vomiting, loss of consciousness and eventually brains damage or death can result.

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1. Why is carbon monoxide so dangerous?
2. What is carbon monoxide (CO) and why do I need a carbon monoxide detector?
3. What are the medical effects of carbon monoxide and how do I recognize them?
4. How many carbon monoxide detectors should I have and where should I place them?
5. What should I do when my carbon monoxide detector goes off?