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Humans are commonly exposed to toxicants through three major routes: ingestion, inhalation, and dermal (skin) absorption. Ingestion involves the intake of toxic substances through food, water, medicines, or accidental swallowing of chemicals. Inhalation occurs when toxic gases, vapors, fumes, dust, or aerosols are breathed into the lungs. Dermal exposure happens when toxicants come into contact with the skin and penetrate through it into the systemic circulation. Among these, inhalation is ________ __________ ___ _________ ______ _________ ____ ____ ______ ___.
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