Which of the following is NOT a route of entry for hazardous substances?

Which of the following is NOT a route of entry for hazardous substances?

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

Answer: (D)

When a hazardous substance enters the body, it can do so mainly by breathing it in (inhalation), swallowing it (ingestion), or by the chemical passing through the skin (absorption). Each of these pathways describes a way the substance gets from the outside environment into the body's tissues. Conduction, on the other hand, is a mode of transferring heat or electricity through materials. It’s not a way for a chemical to enter the body, so it isn’t a route of entry. That’s why the option describing conduction is the correct choice for “not a route of entry.”

When a hazardous substance enters the body, it can do so mainly by breathing it in (inhalation), swallowing it (ingestion), or by the chemical passing through the skin (absorption). Each of these pathways describes a way the substance gets from the outside environment into the body's tissues. Conduction, on the other hand, is a mode of transferring heat or electricity through materials. It’s not a way for a chemical to enter the body, so it isn’t a route of entry. That’s why the option describing conduction is the correct choice for “not a route of entry.”