When a man inhales air containing normal...

When a man inhales air containing normal concentration of `O_(2)` as well as CO he suffers from suffocation because

1)Haemoglobin combines with co instead of with `O_(2)` and product cannot dissociate

2)co reacts with `O_(2)` reducing percentage of `O_(2)` in the blood

3)CO affects the diaphragm and intercoastal muscles

4)CO affects the nerve of the lungs

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