What is the effect of high concentrations of H2S gas on personnel?
Official USCG Answer & Rule Citation
Correct Answer: Option B — paralyze your breathing system
High concentrations of H2S act directly on the nervous system, specifically targeting the respiratory center in the brain. This exposure causes immediate paralysis of the breathing system, leading to rapid asphyxiation. This is why H2S is considered one of the most lethal hazards encountered in the maritime and drilling industries.
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