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FEMA IS-005.A: AN INTRODUCTION TO HAZARDOUS MATERIALS EXAM 2025 QUESTIONS AND ANSWERS Absorption - ....ANSWER ...-The passing of a substance into the circulatory system of the body. Also used specifically to refer to entry of toxicants through the skin. ACGIH - ....ANSWER ...-American Conference of Governmental Industrial Hygienist Acute Exposure - ....ANSWER ...-An exposure to a toxic substance which occurs in a short or single time period. Acute Toxicity - ....ANSWER ...-Any poisonous effect produced by a single short- term exposure. The LD50 of a substance (the lethal does at which 50% of test animals succumb to the toxicity of the chemical) is typically used as a measure of its acute toxicity. Additive Effect - ....ANSWER ...-A biological response to exposure to multiple chemicals which is equal to the sum of the effects of the individual agents. Adsorption - ....ANSWER ...-The bonding of chemicals to soil particles or other surfaces. ....FOR STUDY PURPOSES...©️2025 ALL RIGHTS RESERVED... 1