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Humans are commonly exposed to toxicants through three main routes: ingestion, inhalation, and dermal contact. Ingestion occurs when toxic substances are swallowed and enter the gastrointestinal tract, inhalation involves breathing in toxicants through the respiratory system, and dermal contact occurs when chemicals come into contact with the skin, potentially penetrating and entering the bloodstream. Among these, inhalation is a particularly significant route _____ ____ ___ _______ __________ ___ ________.
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