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They don't. The first lungfull of CO2, they pass out, death is almost instantly after. Certain biological processes continue for a few minutes, but there is no awareness of this on the part of the animal. I was on a Fire/Rescue team in a manufacturing facility with a CO2 fire suppression system in one area of the plant. If it went off and someone happened to be in the room, they would die if they couldn't immediately hold their breath. Unfortunately, a persons' first reaction in an emergency is to inhale in order to oxygenate the body for the "fight or flight" response, so survival in this situation was not a guarantee. Thankfully, I never had to pull anyone out, alive or otherwise.
Steve
They don't. The first lungfull of CO2, they pass out, death is almost instantly after. Certain biological processes continue for a few minutes, but there is no awareness of this on the part of the animal. I was on a Fire/Rescue team in a manufacturing facility with a CO2 fire suppression system in one area of the plant. If it went off and someone happened to be in the room, they would die if they couldn't immediately hold their breath. Unfortunately, a persons' first reaction in an emergency is to inhale in order to oxygenate the body for the "fight or flight" response, so survival in this situation was not a guarantee. Thankfully, I never had to pull anyone out, alive or otherwise.
Steve