Which method of exposure involves substances entering the body through skin or mucous membranes?

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

Answer: (C)

The correct answer is absorption, as this method specifically refers to the process by which hazardous substances enter the body through the skin or mucous membranes. When a contaminant comes into contact with the skin, it can penetrate the outer layer and enter the bloodstream, leading to potential health risks. This route is particularly significant in hazardous materials situations because many substances can be harmful or even lethal if absorbed through the skin.

Inhalation involves substances entering the body via the respiratory system, which includes inhaling vapors, dust, fumes, or gases. This pathway affects the lungs and often leads to rapid systemic effects due to the direct entry of particles into the bloodstream.

Ingestion refers to the process of consuming substances through the digestive system, typically via food or drink. This route can also pose health risks, particularly with hazardous materials, but it does not involve direct contact with the skin or mucous membranes.

Injection is a method that involves substances being directly introduced into the body, usually through a needle or similar instrument. This route bypasses skin and mucous membranes entirely, leading to immediate systemic effects but is not applicable to casual exposure scenarios like the skin or mucous membrane contact characterized by absorption.