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Hazardous Materials Management System Practice Test

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A responder exposed to a single dose of hydrogen cyanide at a hazmat incident would be categorized as which type of exposure?
Correct Answer:
Acute exposure
Explanation:
Acute exposure means a short-term exposure to a hazardous substance with effects that appear rapidly after the exposure. Hydrogen cyanide acts quickly by inhibiting cellular respiration, so a responder exposed in a single incident would experience fast-appearing symptoms, fitting acute exposure. Chronic exposure would involve long-term or repeated exposure over an extended period; recurrent exposure implies multiple separate exposures; subacute exposure refers to effects developing over days to weeks. Therefore, a one-time exposure is categorized as acute.

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