Which exposure occurs when hazardous chemicals contact the skin and pass into the muscle tissue, often without awareness?

Which exposure occurs when hazardous chemicals contact the skin and pass into the muscle tissue, often without awareness?

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

Answer: (A)

Absorption is the route by which hazardous chemicals that contact the skin penetrate the outer barrier and move into deeper tissues, such as muscle, and can do so without obvious symptoms. The skin isn’t an impenetrable shield—lipid-loving chemicals or solvents can dissolve into the skin’s layers and diffuse into underlying tissues or into the bloodstream, especially if the skin is damaged, the exposure is prolonged, the chemical is highly concentrated, or conditions (like temperature) favor diffusion. In many work situations, people may not feel anything yet a chemical is silently crossing into body tissues. This differs from ingestion, which is the chemical entering through the mouth and GI tract, and from inhalation, which is taken in through the lungs. A simple touch or surface contact doesn’t necessarily imply absorption—only when the chemical crosses the skin barrier and reaches deeper tissues does it count as absorption.

Absorption is the route by which hazardous chemicals that contact the skin penetrate the outer barrier and move into deeper tissues, such as muscle, and can do so without obvious symptoms. The skin isn’t an impenetrable shield—lipid-loving chemicals or solvents can dissolve into the skin’s layers and diffuse into underlying tissues or into the bloodstream, especially if the skin is damaged, the exposure is prolonged, the chemical is highly concentrated, or conditions (like temperature) favor diffusion. In many work situations, people may not feel anything yet a chemical is silently crossing into body tissues.

This differs from ingestion, which is the chemical entering through the mouth and GI tract, and from inhalation, which is taken in through the lungs. A simple touch or surface contact doesn’t necessarily imply absorption—only when the chemical crosses the skin barrier and reaches deeper tissues does it count as absorption.