Which term describes the route of exposure through the skin?

• A. Ingestion
• B. Absorption
• C. Inhalation
• D. Injection

Answer: (B)

Absorption describes exposure that occurs through the skin. When a chemical or toxin contacts the skin, it can pass into the body from the surface through the skin layers and reach the bloodstream—especially if the chemical is lipid-soluble, the skin is wet or damaged, or contact is prolonged. This dermal absorption is why decontamination often starts with removing contaminated clothing and washing the skin promptly. Ingestion involves swallowing a substance that then enters the digestive system; inhalation means the substance is breathed in through the lungs; injection refers to entry directly into tissues via a puncture or needle.