Which statement describes contact effects?

• A. Throughout the body
• B. In the bloodstream
• C. In the lungs
• D. At the site of exposure

Answer: (D)

Contact effects are localized responses that happen right where a substance first touches the body. That’s why describing the effects as occurring at the site of exposure makes the most sense: the interaction between the chemical and skin or mucous membranes produces irritation, redness, or a burn at that exact spot before anything spreads elsewhere. If the substance is absorbed into the bloodstream or inhaled into the lungs, you might then see effects in other parts of the body—these are systemic or organ-specific effects, not contact effects. For example, a chemical splash on the skin often causes a local reaction at that area, which is characteristic of contact effects.